Arrays with values that start or end with vtab ("\v") must be quoted.
Postgres's array parser skips leading and trailing whitespace with
the array_isspace() function, which is slightly different from the
scanner_isspace() function that was previously linked. Add a test
that reproduces this failure, and fix the definition of isSpace.
This also includes a change to use strings.EqualFold which should
really not matter, but does not require copying the string.