Allow setting nil to pgtype.Bool

pgtype/bool.go

@@ -13,6 +13,11 @@ type Bool struct {
 }
 
 func (dst *Bool) Set(src interface{}) error {
+	if src == nil {
+		*dst = Bool{Status: Null}
+		return nil
+	}
+
 	switch value := src.(type) {
 	case bool:
 		*dst = Bool{Bool: value, Status: Present}

pgtype/bool_test.go

@@ -29,6 +29,7 @@ func TestBoolSet(t *testing.T) {
 		{source: "f", result: pgtype.Bool{Bool: false, Status: pgtype.Present}},
 		{source: _bool(true), result: pgtype.Bool{Bool: true, Status: pgtype.Present}},
 		{source: _bool(false), result: pgtype.Bool{Bool: false, Status: pgtype.Present}},
+		{source: nil, result: pgtype.Bool{Status: pgtype.Null}},
 	}
 
 	for i, tt := range successfulTests {