PropTypes.*.weak is confusing (and undocumented)

[chenglou]

It's not clear right now what weak does.

[sophiebits]

More importantly, why would you want weak?

[zpao]

It's used for oneOfType so that the validation can be run in a way that doesn't go through the invariant path.

[chenglou]

Can we remove this now? Since PropTypes no longer throws, and the only is that .weak suppresses the warning itself.
@cpojer

[sophiebits]

No, oneOfType still needs to skip the warning.