Fix injection for optional variadic arguments.

Merge pull request rdlowrey#156 from shadowhand/fix/never-cache-closu…

…re-params

Prevent caching of delegate closures

Revert "remove sharing/alias conflict limitation"

This reverts commit 2fdd89d.

remove sharing/alias conflict limitation

Merge pull request rdlowrey#131 from Danack/improve_exception_messages

Improve exception messages for invalid callables

Merge pull request rdlowrey#131 from Danack/improve_exception_messages

Improve exception messages for invalid callables

Merge pull request rdlowrey#131 from Danack/improve_exception_messages

Improve exception messages for invalid callables

Merge pull request rdlowrey#131 from Danack/improve_exception_messages

Improve exception messages for invalid callables

Issue rdlowrey#116: meaningful prepare return values

Merge pull request rdlowrey#113 from Danack/prepareError

Add check for when making an object has failed.