rb_enc_interned_str: handle autoloaded encodings
If called with an autoloaded encoding that was not yet initialized, rb_enc_interned_str would crash with a NULL pointer exception.
rb_enc_interned_str
See: https://github.com/ruby/ruby/pull/4119#issuecomment-800189841
rb_enc_interned_str: handle autoloaded encodings
If called with an autoloaded encoding that was not yet
initialized,
rb_enc_interned_str
would crash witha NULL pointer exception.
See: https://github.com/ruby/ruby/pull/4119#issuecomment-800189841