diff --git a/.ci.readme.fmt.sh b/.ci.readme.fmt.sh
new file mode 100755
index 0000000..045cb5f
--- /dev/null
+++ b/.ci.readme.fmt.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# Verify that the code snippets in README.md are formatted.
+# The tool https://github.com/hougesen/mdsf is used.
+
+if [ -n "$(mdsf verify --config .mdsf.json --log-level error README.md 2>&1)" ]; then
+  echo "Go code in the README.md is not formatted."
+  echo "Did you forget to run 'mdsf format --config .mdsf.json README.md'?"
+  mdsf format --config .mdsf.json README.md
+  git diff
+  exit 1
+fi
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 1dd4e65..2aed145 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -15,8 +15,10 @@ jobs:
         uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go_version }}
+      - run: npm install -g mdsf-cli
       - run: ./.ci.gogenerate.sh
       - run: ./.ci.gofmt.sh
+      - run: ./.ci.readme.fmt.sh
       - run: ./.ci.govet.sh
       - run: go test -v -race ./...
   test:
diff --git a/.mdsf.json b/.mdsf.json
new file mode 100644
index 0000000..884bbbe
--- /dev/null
+++ b/.mdsf.json
@@ -0,0 +1,12 @@
+{
+  "$schema": "https://raw.githubusercontent.com/hougesen/mdsf/main/schemas/v0.8.2/mdsf.schema.json",
+  "format_finished_document": false,
+  "languages": {
+    "go": [
+      [
+        "gofmt",
+        "goimports"
+      ]
+    ]
+  }
+}
diff --git a/MAINTAINERS.md b/MAINTAINERS.md
index cb9a39a..120c463 100644
--- a/MAINTAINERS.md
+++ b/MAINTAINERS.md
@@ -6,5 +6,12 @@ pull requests.
   * @boyan-soubachov
   * @dolmen
   * @MovieStoreGuy
-  * @arjunmahishi
   * @brackendawson
+
+## Approvers
+
+The individuals listed below are active in the project and have the ability to approve pull
+requests.
+
+  * @arjunmahishi
+  * @ccoVeille
diff --git a/README.md b/README.md
index d4857d3..44d40e6 100644
--- a/README.md
+++ b/README.md
@@ -38,30 +38,27 @@ See it in action:
 package yours
 
 import (
-  "testing"
-  "github.com/stretchr/testify/assert"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestSomething(t *testing.T) {
+	// assert equality
+	assert.Equal(t, 123, 123, "they should be equal")
 
-  // assert equality
-  assert.Equal(t, 123, 123, "they should be equal")
+	// assert inequality
+	assert.NotEqual(t, 123, 456, "they should not be equal")
 
-  // assert inequality
-  assert.NotEqual(t, 123, 456, "they should not be equal")
-
-  // assert for nil (good for errors)
-  assert.Nil(t, object)
-
-  // assert for not nil (good when you expect something)
-  if assert.NotNil(t, object) {
-
-    // now we know that object isn't nil, we are safe to make
-    // further assertions without causing any errors
-    assert.Equal(t, "Something", object.Value)
-
-  }
+	// assert for nil (good for errors)
+	assert.Nil(t, object)
 
+	// assert for not nil (good when you expect something)
+	if assert.NotNil(t, object) {
+		// now we know that object isn't nil, we are safe to make
+		// further assertions without causing any errors
+		assert.Equal(t, "Something", object.Value)
+	}
 }
 ```
 
@@ -74,29 +71,29 @@ if you assert many times, use the below:
 package yours
 
 import (
-  "testing"
-  "github.com/stretchr/testify/assert"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestSomething(t *testing.T) {
-  assert := assert.New(t)
+	assert := assert.New(t)
 
-  // assert equality
-  assert.Equal(123, 123, "they should be equal")
+	// assert equality
+	assert.Equal(123, 123, "they should be equal")
 
-  // assert inequality
-  assert.NotEqual(123, 456, "they should not be equal")
+	// assert inequality
+	assert.NotEqual(123, 456, "they should not be equal")
 
-  // assert for nil (good for errors)
-  assert.Nil(object)
+	// assert for nil (good for errors)
+	assert.Nil(object)
 
-  // assert for not nil (good when you expect something)
-  if assert.NotNil(object) {
-
-    // now we know that object isn't nil, we are safe to make
-    // further assertions without causing any errors
-    assert.Equal("Something", object.Value)
-  }
+	// assert for not nil (good when you expect something)
+	if assert.NotNil(object) {
+		// now we know that object isn't nil, we are safe to make
+		// further assertions without causing any errors
+		assert.Equal("Something", object.Value)
+	}
 }
 ```
 
@@ -120,8 +117,9 @@ An example test function that tests a piece of code that relies on an external o
 package yours
 
 import (
-  "testing"
-  "github.com/stretchr/testify/mock"
+	"testing"
+
+	"github.com/stretchr/testify/mock"
 )
 
 /*
@@ -130,8 +128,8 @@ import (
 
 // MyMockedObject is a mocked object that implements an interface
 // that describes an object that the code I am testing relies on.
-type MyMockedObject struct{
-  mock.Mock
+type MyMockedObject struct {
+	mock.Mock
 }
 
 // DoSomething is a method on MyMockedObject that implements some interface
@@ -142,10 +140,8 @@ type MyMockedObject struct{
 //
 // NOTE: This method is not being tested here, code that uses this object is.
 func (m *MyMockedObject) DoSomething(number int) (bool, error) {
-
-  args := m.Called(number)
-  return args.Bool(0), args.Error(1)
-
+	args := m.Called(number)
+	return args.Bool(0), args.Error(1)
 }
 
 /*
@@ -155,20 +151,17 @@ func (m *MyMockedObject) DoSomething(number int) (bool, error) {
 // TestSomething is an example of how to use our test object to
 // make assertions about some target code we are testing.
 func TestSomething(t *testing.T) {
+	// create an instance of our test object
+	testObj := new(MyMockedObject)
 
-  // create an instance of our test object
-  testObj := new(MyMockedObject)
-
-  // set up expectations
-  testObj.On("DoSomething", 123).Return(true, nil)
-
-  // call the code we are testing
-  targetFuncThatDoesSomethingWithObj(testObj)
-
-  // assert that the expectations were met
-  testObj.AssertExpectations(t)
+	// set up expectations
+	testObj.On("DoSomething", 123).Return(true, nil)
 
+	// call the code we are testing
+	targetFuncThatDoesSomethingWithObj(testObj)
 
+	// assert that the expectations were met
+	testObj.AssertExpectations(t)
 }
 
 // TestSomethingWithPlaceholder is a second example of how to use our test object to
@@ -177,45 +170,42 @@ func TestSomething(t *testing.T) {
 // data being passed in is normally dynamically generated and cannot be
 // predicted beforehand (eg. containing hashes that are time sensitive)
 func TestSomethingWithPlaceholder(t *testing.T) {
+	// create an instance of our test object
+	testObj := new(MyMockedObject)
 
-  // create an instance of our test object
-  testObj := new(MyMockedObject)
+	// set up expectations with a placeholder in the argument list
+	testObj.On("DoSomething", mock.Anything).Return(true, nil)
 
-  // set up expectations with a placeholder in the argument list
-  testObj.On("DoSomething", mock.Anything).Return(true, nil)
-
-  // call the code we are testing
-  targetFuncThatDoesSomethingWithObj(testObj)
-
-  // assert that the expectations were met
-  testObj.AssertExpectations(t)
+	// call the code we are testing
+	targetFuncThatDoesSomethingWithObj(testObj)
 
+	// assert that the expectations were met
+	testObj.AssertExpectations(t)
 
 }
 
 // TestSomethingElse2 is a third example that shows how you can use
 // the Unset method to cleanup handlers and then add new ones.
 func TestSomethingElse2(t *testing.T) {
+	// create an instance of our test object
+	testObj := new(MyMockedObject)
 
-  // create an instance of our test object
-  testObj := new(MyMockedObject)
+	// set up expectations with a placeholder in the argument list
+	mockCall := testObj.On("DoSomething", mock.Anything).Return(true, nil)
 
-  // set up expectations with a placeholder in the argument list
-  mockCall := testObj.On("DoSomething", mock.Anything).Return(true, nil)
+	// call the code we are testing
+	targetFuncThatDoesSomethingWithObj(testObj)
 
-  // call the code we are testing
-  targetFuncThatDoesSomethingWithObj(testObj)
+	// assert that the expectations were met
+	testObj.AssertExpectations(t)
 
-  // assert that the expectations were met
-  testObj.AssertExpectations(t)
+	// remove the handler now so we can add another one that takes precedence
+	mockCall.Unset()
 
-  // remove the handler now so we can add another one that takes precedence
-  mockCall.Unset()
+	// return false now instead of true
+	testObj.On("DoSomething", mock.Anything).Return(false, nil)
 
-  // return false now instead of true
-  testObj.On("DoSomething", mock.Anything).Return(false, nil)
-
-  testObj.AssertExpectations(t)
+	testObj.AssertExpectations(t)
 }
 ```
 
@@ -235,35 +225,36 @@ An example suite is shown below:
 ```go
 // Basic imports
 import (
-    "testing"
-    "github.com/stretchr/testify/assert"
-    "github.com/stretchr/testify/suite"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
 )
 
 // Define the suite, and absorb the built-in basic suite
 // functionality from testify - including a T() method which
 // returns the current testing context
 type ExampleTestSuite struct {
-    suite.Suite
-    VariableThatShouldStartAtFive int
+	suite.Suite
+	VariableThatShouldStartAtFive int
 }
 
 // Make sure that VariableThatShouldStartAtFive is set to five
 // before each test
 func (suite *ExampleTestSuite) SetupTest() {
-    suite.VariableThatShouldStartAtFive = 5
+	suite.VariableThatShouldStartAtFive = 5
 }
 
 // All methods that begin with "Test" are run as tests within a
 // suite.
 func (suite *ExampleTestSuite) TestExample() {
-    assert.Equal(suite.T(), 5, suite.VariableThatShouldStartAtFive)
+	assert.Equal(suite.T(), 5, suite.VariableThatShouldStartAtFive)
 }
 
 // In order for 'go test' to run this suite, we need to create
 // a normal test function and pass our suite to suite.Run
 func TestExampleTestSuite(t *testing.T) {
-    suite.Run(t, new(ExampleTestSuite))
+	suite.Run(t, new(ExampleTestSuite))
 }
 ```
 
@@ -276,33 +267,34 @@ For more information on writing suites, check out the [API documentation for the
 ```go
 // Basic imports
 import (
-    "testing"
-    "github.com/stretchr/testify/suite"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
 )
 
 // Define the suite, and absorb the built-in basic suite
 // functionality from testify - including assertion methods.
 type ExampleTestSuite struct {
-    suite.Suite
-    VariableThatShouldStartAtFive int
+	suite.Suite
+	VariableThatShouldStartAtFive int
 }
 
 // Make sure that VariableThatShouldStartAtFive is set to five
 // before each test
 func (suite *ExampleTestSuite) SetupTest() {
-    suite.VariableThatShouldStartAtFive = 5
+	suite.VariableThatShouldStartAtFive = 5
 }
 
 // All methods that begin with "Test" are run as tests within a
 // suite.
 func (suite *ExampleTestSuite) TestExample() {
-    suite.Equal(suite.VariableThatShouldStartAtFive, 5)
+	suite.Equal(suite.VariableThatShouldStartAtFive, 5)
 }
 
 // In order for 'go test' to run this suite, we need to create
 // a normal test function and pass our suite to suite.Run
 func TestExampleTestSuite(t *testing.T) {
-    suite.Run(t, new(ExampleTestSuite))
+	suite.Run(t, new(ExampleTestSuite))
 }
 ```
 
@@ -329,14 +321,13 @@ Import the `testify/assert` package into your code using this template:
 package yours
 
 import (
-  "testing"
-  "github.com/stretchr/testify/assert"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestSomething(t *testing.T) {
-
-  assert.True(t, true, "True is true!")
-
+	assert.True(t, true, "True is true!")
 }
 ```
 
diff --git a/assert/assertion_compare.go b/assert/assertion_compare.go
index 7e19eba..ffb24e8 100644
--- a/assert/assertion_compare.go
+++ b/assert/assertion_compare.go
@@ -390,7 +390,8 @@ func Greater(t TestingT, e1 interface{}, e2 interface{}, msgAndArgs ...interface
 	if h, ok := t.(tHelper); ok {
 		h.Helper()
 	}
-	return compareTwoValues(t, e1, e2, []compareResult{compareGreater}, "\"%v\" is not greater than \"%v\"", msgAndArgs...)
+	failMessage := fmt.Sprintf("\"%v\" is not greater than \"%v\"", e1, e2)
+	return compareTwoValues(t, e1, e2, []compareResult{compareGreater}, failMessage, msgAndArgs...)
 }
 
 // GreaterOrEqual asserts that the first element is greater than or equal to the second
@@ -403,7 +404,8 @@ func GreaterOrEqual(t TestingT, e1 interface{}, e2 interface{}, msgAndArgs ...in
 	if h, ok := t.(tHelper); ok {
 		h.Helper()
 	}
-	return compareTwoValues(t, e1, e2, []compareResult{compareGreater, compareEqual}, "\"%v\" is not greater than or equal to \"%v\"", msgAndArgs...)
+	failMessage := fmt.Sprintf("\"%v\" is not greater than or equal to \"%v\"", e1, e2)
+	return compareTwoValues(t, e1, e2, []compareResult{compareGreater, compareEqual}, failMessage, msgAndArgs...)
 }
 
 // Less asserts that the first element is less than the second
@@ -415,7 +417,8 @@ func Less(t TestingT, e1 interface{}, e2 interface{}, msgAndArgs ...interface{})
 	if h, ok := t.(tHelper); ok {
 		h.Helper()
 	}
-	return compareTwoValues(t, e1, e2, []compareResult{compareLess}, "\"%v\" is not less than \"%v\"", msgAndArgs...)
+	failMessage := fmt.Sprintf("\"%v\" is not less than \"%v\"", e1, e2)
+	return compareTwoValues(t, e1, e2, []compareResult{compareLess}, failMessage, msgAndArgs...)
 }
 
 // LessOrEqual asserts that the first element is less than or equal to the second
@@ -428,7 +431,8 @@ func LessOrEqual(t TestingT, e1 interface{}, e2 interface{}, msgAndArgs ...inter
 	if h, ok := t.(tHelper); ok {
 		h.Helper()
 	}
-	return compareTwoValues(t, e1, e2, []compareResult{compareLess, compareEqual}, "\"%v\" is not less than or equal to \"%v\"", msgAndArgs...)
+	failMessage := fmt.Sprintf("\"%v\" is not less than or equal to \"%v\"", e1, e2)
+	return compareTwoValues(t, e1, e2, []compareResult{compareLess, compareEqual}, failMessage, msgAndArgs...)
 }
 
 // Positive asserts that the specified element is positive
@@ -440,7 +444,8 @@ func Positive(t TestingT, e interface{}, msgAndArgs ...interface{}) bool {
 		h.Helper()
 	}
 	zero := reflect.Zero(reflect.TypeOf(e))
-	return compareTwoValues(t, e, zero.Interface(), []compareResult{compareGreater}, "\"%v\" is not positive", msgAndArgs...)
+	failMessage := fmt.Sprintf("\"%v\" is not positive", e)
+	return compareTwoValues(t, e, zero.Interface(), []compareResult{compareGreater}, failMessage, msgAndArgs...)
 }
 
 // Negative asserts that the specified element is negative
@@ -452,7 +457,8 @@ func Negative(t TestingT, e interface{}, msgAndArgs ...interface{}) bool {
 		h.Helper()
 	}
 	zero := reflect.Zero(reflect.TypeOf(e))
-	return compareTwoValues(t, e, zero.Interface(), []compareResult{compareLess}, "\"%v\" is not negative", msgAndArgs...)
+	failMessage := fmt.Sprintf("\"%v\" is not negative", e)
+	return compareTwoValues(t, e, zero.Interface(), []compareResult{compareLess}, failMessage, msgAndArgs...)
 }
 
 func compareTwoValues(t TestingT, e1 interface{}, e2 interface{}, allowedComparesResults []compareResult, failMessage string, msgAndArgs ...interface{}) bool {
@@ -468,11 +474,11 @@ func compareTwoValues(t TestingT, e1 interface{}, e2 interface{}, allowedCompare
 
 	compareResult, isComparable := compare(e1, e2, e1Kind)
 	if !isComparable {
-		return Fail(t, fmt.Sprintf("Can not compare type \"%s\"", reflect.TypeOf(e1)), msgAndArgs...)
+		return Fail(t, fmt.Sprintf(`Can not compare type "%T"`, e1), msgAndArgs...)
 	}
 
 	if !containsValue(allowedComparesResults, compareResult) {
-		return Fail(t, fmt.Sprintf(failMessage, e1, e2), msgAndArgs...)
+		return Fail(t, failMessage, msgAndArgs...)
 	}
 
 	return true
diff --git a/assert/assertion_order.go b/assert/assertion_order.go
index 1d2f718..2fdf80f 100644
--- a/assert/assertion_order.go
+++ b/assert/assertion_order.go
@@ -33,7 +33,7 @@ func isOrdered(t TestingT, object interface{}, allowedComparesResults []compareR
 		compareResult, isComparable := compare(prevValueInterface, valueInterface, firstValueKind)
 
 		if !isComparable {
-			return Fail(t, fmt.Sprintf("Can not compare type \"%s\" and \"%s\"", reflect.TypeOf(value), reflect.TypeOf(prevValue)), msgAndArgs...)
+			return Fail(t, fmt.Sprintf(`Can not compare type "%T" and "%T"`, value, prevValue), msgAndArgs...)
 		}
 
 		if !containsValue(allowedComparesResults, compareResult) {
diff --git a/assert/assertions.go b/assert/assertions.go
index 295144d..a9318cf 100644
--- a/assert/assertions.go
+++ b/assert/assertions.go
@@ -24,6 +24,8 @@ import (
 	"github.com/stretchr/testify/assert/yaml"
 )
 
+const stackFrameBufferSize = 10
+
 //go:generate sh -c "cd ../_codegen && go build && cd - && ../_codegen/_codegen -output-package=assert -template=assertion_format.go.tmpl"
 
 // TestingT is an interface wrapper around *testing.T
@@ -212,57 +214,73 @@ the problem actually occurred in calling code.*/
 func CallerInfo() []string {
 
 	var pc uintptr
-	var ok bool
 	var file string
 	var line int
 	var name string
 
 	callers := []string{}
-	for i := 0; ; i++ {
-		pc, file, line, ok = runtime.Caller(i)
-		if !ok {
-			// The breaks below failed to terminate the loop, and we ran off the
-			// end of the call stack.
+	pcs := make([]uintptr, stackFrameBufferSize)
+	offset := 1
+
+	for {
+		n := runtime.Callers(offset, pcs)
+
+		if n == 0 {
 			break
 		}
 
-		// This is a huge edge case, but it will panic if this is the case, see #180
-		if file == "<autogenerated>" {
-			break
-		}
+		frames := runtime.CallersFrames(pcs[:n])
 
-		f := runtime.FuncForPC(pc)
-		if f == nil {
-			break
-		}
-		name = f.Name()
+		for {
+			frame, more := frames.Next()
+			pc = frame.PC
+			file = frame.File
+			line = frame.Line
 
-		// testing.tRunner is the standard library function that calls
-		// tests. Subtests are called directly by tRunner, without going through
-		// the Test/Benchmark/Example function that contains the t.Run calls, so
-		// with subtests we should break when we hit tRunner, without adding it
-		// to the list of callers.
-		if name == "testing.tRunner" {
-			break
-		}
+			// This is a huge edge case, but it will panic if this is the case, see #180
+			if file == "<autogenerated>" {
+				break
+			}
 
-		parts := strings.Split(file, "/")
-		if len(parts) > 1 {
-			filename := parts[len(parts)-1]
-			dir := parts[len(parts)-2]
-			if (dir != "assert" && dir != "mock" && dir != "require") || filename == "mock_test.go" {
-				callers = append(callers, fmt.Sprintf("%s:%d", file, line))
+			f := runtime.FuncForPC(pc)
+			if f == nil {
+				break
+			}
+			name = f.Name()
+
+			// testing.tRunner is the standard library function that calls
+			// tests. Subtests are called directly by tRunner, without going through
+			// the Test/Benchmark/Example function that contains the t.Run calls, so
+			// with subtests we should break when we hit tRunner, without adding it
+			// to the list of callers.
+			if name == "testing.tRunner" {
+				break
+			}
+
+			parts := strings.Split(file, "/")
+			if len(parts) > 1 {
+				filename := parts[len(parts)-1]
+				dir := parts[len(parts)-2]
+				if (dir != "assert" && dir != "mock" && dir != "require") || filename == "mock_test.go" {
+					callers = append(callers, fmt.Sprintf("%s:%d", file, line))
+				}
+			}
+
+			// Drop the package
+			segments := strings.Split(name, ".")
+			name = segments[len(segments)-1]
+			if isTest(name, "Test") ||
+				isTest(name, "Benchmark") ||
+				isTest(name, "Example") {
+				break
+			}
+			if !more {
+				break
 			}
 		}
+		// We know we already have less than a buffer's worth of frames
+		offset += stackFrameBufferSize
 
-		// Drop the package
-		segments := strings.Split(name, ".")
-		name = segments[len(segments)-1]
-		if isTest(name, "Test") ||
-			isTest(name, "Benchmark") ||
-			isTest(name, "Example") {
-			break
-		}
 	}
 
 	return callers
@@ -444,7 +462,7 @@ func IsType(t TestingT, expectedType interface{}, object interface{}, msgAndArgs
 	}
 
 	if !ObjectsAreEqual(reflect.TypeOf(object), reflect.TypeOf(expectedType)) {
-		return Fail(t, fmt.Sprintf("Object expected to be of type %v, but was %v", reflect.TypeOf(expectedType), reflect.TypeOf(object)), msgAndArgs...)
+		return Fail(t, fmt.Sprintf("Object expected to be of type %T, but was %T", expectedType, object), msgAndArgs...)
 	}
 
 	return true
@@ -1069,7 +1087,7 @@ func NotSubset(t TestingT, list, subset interface{}, msgAndArgs ...interface{})
 		element := subsetList.Index(i).Interface()
 		ok, found := containsElement(list, element)
 		if !ok {
-			return Fail(t, fmt.Sprintf("\"%s\" could not be applied builtin len()", list), msgAndArgs...)
+			return Fail(t, fmt.Sprintf("%q could not be applied builtin len()", list), msgAndArgs...)
 		}
 		if !found {
 			return true
@@ -2100,7 +2118,7 @@ func ErrorIs(t TestingT, err, target error, msgAndArgs ...interface{}) bool {
 		expectedText = target.Error()
 	}
 
-	chain := buildErrorChainString(err)
+	chain := buildErrorChainString(err, false)
 
 	return Fail(t, fmt.Sprintf("Target error should be in err chain:\n"+
 		"expected: %q\n"+
@@ -2123,7 +2141,7 @@ func NotErrorIs(t TestingT, err, target error, msgAndArgs ...interface{}) bool {
 		expectedText = target.Error()
 	}
 
-	chain := buildErrorChainString(err)
+	chain := buildErrorChainString(err, false)
 
 	return Fail(t, fmt.Sprintf("Target error should not be in err chain:\n"+
 		"found: %q\n"+
@@ -2141,11 +2159,11 @@ func ErrorAs(t TestingT, err error, target interface{}, msgAndArgs ...interface{
 		return true
 	}
 
-	chain := buildErrorChainString(err)
+	chain := buildErrorChainString(err, true)
 
 	return Fail(t, fmt.Sprintf("Should be in error chain:\n"+
-		"expected: %q\n"+
-		"in chain: %s", target, chain,
+		"expected: %s\n"+
+		"in chain: %s", reflect.ValueOf(target).Elem().Type(), chain,
 	), msgAndArgs...)
 }
 
@@ -2159,24 +2177,46 @@ func NotErrorAs(t TestingT, err error, target interface{}, msgAndArgs ...interfa
 		return true
 	}
 
-	chain := buildErrorChainString(err)
+	chain := buildErrorChainString(err, true)
 
 	return Fail(t, fmt.Sprintf("Target error should not be in err chain:\n"+
-		"found: %q\n"+
-		"in chain: %s", target, chain,
+		"found: %s\n"+
+		"in chain: %s", reflect.ValueOf(target).Elem().Type(), chain,
 	), msgAndArgs...)
 }
 
-func buildErrorChainString(err error) string {
+func unwrapAll(err error) (errs []error) {
+	errs = append(errs, err)
+	switch x := err.(type) {
+	case interface{ Unwrap() error }:
+		err = x.Unwrap()
+		if err == nil {
+			return
+		}
+		errs = append(errs, unwrapAll(err)...)
+	case interface{ Unwrap() []error }:
+		for _, err := range x.Unwrap() {
+			errs = append(errs, unwrapAll(err)...)
+		}
+	}
+	return
+}
+
+func buildErrorChainString(err error, withType bool) string {
 	if err == nil {
 		return ""
 	}
 
-	e := errors.Unwrap(err)
-	chain := fmt.Sprintf("%q", err.Error())
-	for e != nil {
-		chain += fmt.Sprintf("\n\t%q", e.Error())
-		e = errors.Unwrap(e)
+	var chain string
+	errs := unwrapAll(err)
+	for i := range errs {
+		if i != 0 {
+			chain += "\n\t"
+		}
+		chain += fmt.Sprintf("%q", errs[i].Error())
+		if withType {
+			chain += fmt.Sprintf(" (%T)", errs[i])
+		}
 	}
 	return chain
 }
diff --git a/assert/assertions_test.go b/assert/assertions_test.go
index 9f859fa..9d27d1b 100644
--- a/assert/assertions_test.go
+++ b/assert/assertions_test.go
@@ -2118,7 +2118,7 @@ func TestRegexp(t *testing.T) {
 	}
 
 	for _, tc := range cases {
-		False(t, Regexp(mockT, tc.rx, tc.str), "Expected \"%s\" to not match \"%s\"", tc.rx, tc.str)
+		False(t, Regexp(mockT, tc.rx, tc.str), "Expected %q to not match %q", tc.rx, tc.str)
 		False(t, Regexp(mockT, regexp.MustCompile(tc.rx), tc.str))
 		False(t, Regexp(mockT, regexp.MustCompile(tc.rx), []byte(tc.str)))
 		True(t, NotRegexp(mockT, tc.rx, tc.str))
@@ -2151,11 +2151,11 @@ func TestZero(t *testing.T) {
 	mockT := new(testing.T)
 
 	for _, test := range zeros {
-		True(t, Zero(mockT, test, "%#v is not the %v zero value", test, reflect.TypeOf(test)))
+		True(t, Zero(mockT, test, "%#v is not the %T zero value", test, test))
 	}
 
 	for _, test := range nonZeros {
-		False(t, Zero(mockT, test, "%#v is not the %v zero value", test, reflect.TypeOf(test)))
+		False(t, Zero(mockT, test, "%#v is not the %T zero value", test, test))
 	}
 }
 
@@ -2163,11 +2163,11 @@ func TestNotZero(t *testing.T) {
 	mockT := new(testing.T)
 
 	for _, test := range zeros {
-		False(t, NotZero(mockT, test, "%#v is not the %v zero value", test, reflect.TypeOf(test)))
+		False(t, NotZero(mockT, test, "%#v is not the %T zero value", test, test))
 	}
 
 	for _, test := range nonZeros {
-		True(t, NotZero(mockT, test, "%#v is not the %v zero value", test, reflect.TypeOf(test)))
+		True(t, NotZero(mockT, test, "%#v is not the %T zero value", test, test))
 	}
 }
 
@@ -3175,11 +3175,13 @@ func parseLabeledOutput(output string) []labeledContent {
 }
 
 type captureTestingT struct {
-	msg string
+	failed bool
+	msg    string
 }
 
 func (ctt *captureTestingT) Errorf(format string, args ...interface{}) {
 	ctt.msg = fmt.Sprintf(format, args...)
+	ctt.failed = true
 }
 
 func (ctt *captureTestingT) checkResultAndErrMsg(t *testing.T, expectedRes, res bool, expectedErrMsg string) {
@@ -3188,6 +3190,10 @@ func (ctt *captureTestingT) checkResultAndErrMsg(t *testing.T, expectedRes, res
 		t.Errorf("Should return %t", expectedRes)
 		return
 	}
+	if res == ctt.failed {
+		t.Errorf("The test result (%t) should be reflected in the testing.T type (%t)", res, !ctt.failed)
+		return
+	}
 	contents := parseLabeledOutput(ctt.msg)
 	if res == true {
 		if contents != nil {
@@ -3348,50 +3354,82 @@ func TestNotErrorIs(t *testing.T) {
 
 func TestErrorAs(t *testing.T) {
 	tests := []struct {
-		err    error
-		result bool
+		err          error
+		result       bool
+		resultErrMsg string
 	}{
-		{fmt.Errorf("wrap: %w", &customError{}), true},
-		{io.EOF, false},
-		{nil, false},
+		{
+			err:    fmt.Errorf("wrap: %w", &customError{}),
+			result: true,
+		},
+		{
+			err:    io.EOF,
+			result: false,
+			resultErrMsg: "" +
+				"Should be in error chain:\n" +
+				"expected: *assert.customError\n" +
+				"in chain: \"EOF\" (*errors.errorString)\n",
+		},
+		{
+			err:    nil,
+			result: false,
+			resultErrMsg: "" +
+				"Should be in error chain:\n" +
+				"expected: *assert.customError\n" +
+				"in chain: \n",
+		},
+		{
+			err:    fmt.Errorf("abc: %w", errors.New("def")),
+			result: false,
+			resultErrMsg: "" +
+				"Should be in error chain:\n" +
+				"expected: *assert.customError\n" +
+				"in chain: \"abc: def\" (*fmt.wrapError)\n" +
+				"\t\"def\" (*errors.errorString)\n",
+		},
 	}
 	for _, tt := range tests {
 		tt := tt
 		var target *customError
 		t.Run(fmt.Sprintf("ErrorAs(%#v,%#v)", tt.err, target), func(t *testing.T) {
-			mockT := new(testing.T)
+			mockT := new(captureTestingT)
 			res := ErrorAs(mockT, tt.err, &target)
-			if res != tt.result {
-				t.Errorf("ErrorAs(%#v,%#v) should return %t", tt.err, target, tt.result)
-			}
-			if res == mockT.Failed() {
-				t.Errorf("The test result (%t) should be reflected in the testing.T type (%t)", res, !mockT.Failed())
-			}
+			mockT.checkResultAndErrMsg(t, tt.result, res, tt.resultErrMsg)
 		})
 	}
 }
 
 func TestNotErrorAs(t *testing.T) {
 	tests := []struct {
-		err    error
-		result bool
+		err          error
+		result       bool
+		resultErrMsg string
 	}{
-		{fmt.Errorf("wrap: %w", &customError{}), false},
-		{io.EOF, true},
-		{nil, true},
+		{
+			err:    fmt.Errorf("wrap: %w", &customError{}),
+			result: false,
+			resultErrMsg: "" +
+				"Target error should not be in err chain:\n" +
+				"found: *assert.customError\n" +
+				"in chain: \"wrap: fail\" (*fmt.wrapError)\n" +
+				"\t\"fail\" (*assert.customError)\n",
+		},
+		{
+			err:    io.EOF,
+			result: true,
+		},
+		{
+			err:    nil,
+			result: true,
+		},
 	}
 	for _, tt := range tests {
 		tt := tt
 		var target *customError
 		t.Run(fmt.Sprintf("NotErrorAs(%#v,%#v)", tt.err, target), func(t *testing.T) {
-			mockT := new(testing.T)
+			mockT := new(captureTestingT)
 			res := NotErrorAs(mockT, tt.err, &target)
-			if res != tt.result {
-				t.Errorf("NotErrorAs(%#v,%#v) should not return %t", tt.err, target, tt.result)
-			}
-			if res == mockT.Failed() {
-				t.Errorf("The test result (%t) should be reflected in the testing.T type (%t)", res, !mockT.Failed())
-			}
+			mockT.checkResultAndErrMsg(t, tt.result, res, tt.resultErrMsg)
 		})
 	}
 }
diff --git a/assert/forward_assertions_test.go b/assert/forward_assertions_test.go
index 496d3c0..5752d44 100644
--- a/assert/forward_assertions_test.go
+++ b/assert/forward_assertions_test.go
@@ -546,7 +546,7 @@ func TestRegexpWrapper(t *testing.T) {
 	}
 
 	for _, tc := range cases {
-		False(t, assert.Regexp(tc.rx, tc.str), "Expected \"%s\" to not match \"%s\"", tc.rx, tc.str)
+		False(t, assert.Regexp(tc.rx, tc.str), "Expected %q to not match %q", tc.rx, tc.str)
 		False(t, assert.Regexp(regexp.MustCompile(tc.rx), tc.str))
 		True(t, assert.NotRegexp(tc.rx, tc.str))
 		True(t, assert.NotRegexp(regexp.MustCompile(tc.rx), tc.str))
diff --git a/assert/http_assertions.go b/assert/http_assertions.go
index 861ed4b..5a6bb75 100644
--- a/assert/http_assertions.go
+++ b/assert/http_assertions.go
@@ -138,7 +138,7 @@ func HTTPBodyContains(t TestingT, handler http.HandlerFunc, method, url string,
 
 	contains := strings.Contains(body, fmt.Sprint(str))
 	if !contains {
-		Fail(t, fmt.Sprintf("Expected response body for \"%s\" to contain \"%s\" but found \"%s\"", url+"?"+values.Encode(), str, body), msgAndArgs...)
+		Fail(t, fmt.Sprintf("Expected response body for %q to contain %q but found %q", url+"?"+values.Encode(), str, body), msgAndArgs...)
 	}
 
 	return contains
@@ -158,7 +158,7 @@ func HTTPBodyNotContains(t TestingT, handler http.HandlerFunc, method, url strin
 
 	contains := strings.Contains(body, fmt.Sprint(str))
 	if contains {
-		Fail(t, fmt.Sprintf("Expected response body for \"%s\" to NOT contain \"%s\" but found \"%s\"", url+"?"+values.Encode(), str, body), msgAndArgs...)
+		Fail(t, fmt.Sprintf("Expected response body for %q to NOT contain %q but found %q", url+"?"+values.Encode(), str, body), msgAndArgs...)
 	}
 
 	return !contains
diff --git a/mock/mock.go b/mock/mock.go
index eb5682d..c81a0bd 100644
--- a/mock/mock.go
+++ b/mock/mock.go
@@ -208,9 +208,16 @@ func (c *Call) On(methodName string, arguments ...interface{}) *Call {
 	return c.Parent.On(methodName, arguments...)
 }
 
-// Unset removes a mock handler from being called.
+// Unset removes all mock handlers that satisfy the call instance arguments from being
+// called. Only supported on call instances with static input arguments.
 //
-//	test.On("func", mock.Anything).Unset()
+// For example, the only handler remaining after the following would be "MyMethod(2, 2)":
+//
+//	Mock.
+//	   On("MyMethod", 2, 2).Return(0).
+//	   On("MyMethod", 3, 3).Return(0).
+//	   On("MyMethod", Anything, Anything).Return(0)
+//	Mock.On("MyMethod", 3, 3).Unset()
 func (c *Call) Unset() *Call {
 	var unlockOnce sync.Once
 
@@ -331,7 +338,10 @@ func (m *Mock) TestData() objx.Map {
 	Setting expectations
 */
 
-// Test sets the test struct variable of the mock object
+// Test sets the [TestingT] on which errors will be reported, otherwise errors
+// will cause a panic.
+// Test should not be called on an object that is going to be used in a
+// goroutine other than the one running the test function.
 func (m *Mock) Test(t TestingT) {
 	m.mutex.Lock()
 	defer m.mutex.Unlock()
@@ -494,7 +504,7 @@ func (m *Mock) MethodCalled(methodName string, arguments ...interface{}) Argumen
 		// expected call found, but it has already been called with repeatable times
 		if call != nil {
 			m.mutex.Unlock()
-			m.fail("\nassert: mock: The method has been called over %d times.\n\tEither do one more Mock.On(\"%s\").Return(...), or remove extra call.\n\tThis call was unexpected:\n\t\t%s\n\tat: %s", call.totalCalls, methodName, callString(methodName, arguments, true), assert.CallerInfo())
+			m.fail("\nassert: mock: The method has been called over %d times.\n\tEither do one more Mock.On(%#v).Return(...), or remove extra call.\n\tThis call was unexpected:\n\t\t%s\n\tat: %s", call.totalCalls, methodName, callString(methodName, arguments, true), assert.CallerInfo())
 		}
 		// we have to fail here - because we don't know what to do
 		// as the return arguments.  This is because:
@@ -514,7 +524,7 @@ func (m *Mock) MethodCalled(methodName string, arguments ...interface{}) Argumen
 				assert.CallerInfo(),
 			)
 		} else {
-			m.fail("\nassert: mock: I don't know what to return because the method call was unexpected.\n\tEither do Mock.On(\"%s\").Return(...) first, or remove the %s() call.\n\tThis method was unexpected:\n\t\t%s\n\tat: %s", methodName, methodName, callString(methodName, arguments, true), assert.CallerInfo())
+			m.fail("\nassert: mock: I don't know what to return because the method call was unexpected.\n\tEither do Mock.On(%#v).Return(...) first, or remove the %s() call.\n\tThis method was unexpected:\n\t\t%s\n\tat: %s", methodName, methodName, callString(methodName, arguments, true), assert.CallerInfo())
 		}
 	}
 
diff --git a/require/doc.go b/require/doc.go
index 9684347..c8e3f94 100644
--- a/require/doc.go
+++ b/require/doc.go
@@ -23,6 +23,8 @@
 //
 // The `require` package have same global functions as in the `assert` package,
 // but instead of returning a boolean result they call `t.FailNow()`.
+// A consequence of this is that it must be called from the goroutine running
+// the test function, not from other goroutines created during the test.
 //
 // Every assertion function also takes an optional string message as the final argument,
 // allowing custom error messages to be appended to the message the assertion method outputs.