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[PATCH] [Bug #21842] Let `rb_interned_str` return US-ASCII if possible [PATCH] [DOC] Update docs for rb_interned_str and related functions (#15897) Related to [Bug #21842]. * rb_interned_str: document what decides whether the returned string is in US-ASCII or BINARY encoding. * rb_interned_str_cstr: include the same description as rb_interned_str for the encoding. This one was still missing the update for US-ASCII and erroneously said the returned string was alwasy in BINARY encoding * rb_str_to_interned_str: document how the encoding of the result is defined. Co-authored-by: Herwin <herwinw@users.noreply.github.com>