Replaced __internal__ argument with warning filters

[radarhere]

Suggestion for #6381

[nulano]

LGTM, except that warnings.catch_warnings is not thread-safe.

https://docs.python.org/3/library/warnings.html#warnings.catch_warnings

Note: The catch_warnings manager works by replacing and then later restoring the module’s showwarning() function and internal list of filter specifications. This means the context manager is modifying global state and therefore is not thread-safe.

@hugovk is this OK?

[nulano]

Thank you both