Grand test fixup (#138)

* start fixing up tests

* fix up tests + automate with drone

* fiddle with linting

* messing about with drone.yml

* some more fiddling

* hmmm

* add cache

* add vendor directory

* verbose

* ci updates

* update some little things

* update sig

vendor/github.com/goccy/go-json/error.go

@@ -0,0 +1,49 @@
+package json
+
+import (
+	"github.com/goccy/go-json/internal/errors"
+)
+
+// Before Go 1.2, an InvalidUTF8Error was returned by Marshal when
+// attempting to encode a string value with invalid UTF-8 sequences.
+// As of Go 1.2, Marshal instead coerces the string to valid UTF-8 by
+// replacing invalid bytes with the Unicode replacement rune U+FFFD.
+//
+// Deprecated: No longer used; kept for compatibility.
+type InvalidUTF8Error = errors.InvalidUTF8Error
+
+// An InvalidUnmarshalError describes an invalid argument passed to Unmarshal.
+// (The argument to Unmarshal must be a non-nil pointer.)
+type InvalidUnmarshalError = errors.InvalidUnmarshalError
+
+// A MarshalerError represents an error from calling a MarshalJSON or MarshalText method.
+type MarshalerError = errors.MarshalerError
+
+// A SyntaxError is a description of a JSON syntax error.
+type SyntaxError = errors.SyntaxError
+
+// An UnmarshalFieldError describes a JSON object key that
+// led to an unexported (and therefore unwritable) struct field.
+//
+// Deprecated: No longer used; kept for compatibility.
+type UnmarshalFieldError = errors.UnmarshalFieldError
+
+// An UnmarshalTypeError describes a JSON value that was
+// not appropriate for a value of a specific Go type.
+type UnmarshalTypeError = errors.UnmarshalTypeError
+
+// An UnsupportedTypeError is returned by Marshal when attempting
+// to encode an unsupported value type.
+type UnsupportedTypeError = errors.UnsupportedTypeError
+
+type UnsupportedValueError = errors.UnsupportedValueError
+
+var (
+	errExceededMaxDepth      = errors.ErrExceededMaxDepth
+	errNotAtBeginningOfValue = errors.ErrNotAtBeginningOfValue
+	errUnexpectedEndOfJSON   = errors.ErrUnexpectedEndOfJSON
+	errExpected              = errors.ErrExpected
+	errInvalidCharacter      = errors.ErrInvalidCharacter
+	errSyntax                = errors.ErrSyntax
+	errMarshaler             = errors.ErrMarshaler
+)