Fix issue #480 by widening the allowed types for lenient().whenever()

[hunterwerlla]

Thank you for submitting a pull request! But first:

• [ x ] Can you back your code up with tests?
• [ x ] Keep your commits clean: squash your commits if necessary.

Issue #480 is caused by constraining the type to Any. To fix this, we can update it to have no constraint like the underlying Java code