type itself implementing ``compare_against_backend`` is that the
:paramref:`.EnvironmentContext.configure.compare_type` callable is favored
first; if it returns ``None``, then the ``compare_against_backend`` method
-will be used, if present on the metadata type. If that reutrns ``None``,
+will be used, if present on the metadata type. If that returns ``None``,
then a basic check for type equivalence is run.
.. versionadded:: 0.7.6 - added support for the ``compare_against_backend()``