New Issue: Add unstable warning to string and byte '.c_str()' method

18266, "arezaii", "Add unstable warning to string and byte '.c_str()' method", "2021-08-20T00:46:01Z"

Review of the string and bytes modules brought up a point about the .c_str() method and how it relates to the broader issue of C interoperability.

The idea is that when discussion around #18016 is resolved, we may be able to do away with .c_str() and rely on a common c_ptrTo() or similar method.

This issue is here to:

  • [ ] Add an unstable warning to the .c_str() method

and track any conversation specific to the possible deprecation of .c_str() in favor of something more universal, as discussed in #18016