Improve type error messages when an object is given

From now on, we always display the given object's type instead of just reporting "object".
Additionally, make the format of return typ

Improve type error messages when an object is given

From now on, we always display the given object's type instead of just reporting "object".
Additionally, make the format of return type errors match the format of argument errors.

Closes GH-5625

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Add support for the mixed type

RFC: https://wiki.php.net/rfc/mixed_type_v2
Closes GH-5313

Co-authored-by: Dan Ackroyd <danack@basereality.com>