jinja
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add MutableSequence.{clear,pop} to modifies_known_mutable check
This PR adds the attributes clear and pop on MutableSequence to the default modifies_known_mutable check used by ImmutableSandboxedEnvironment.
fixes #2032
Let me know if I should add an entry to CHANGES.rst. I didn't see any previous mention of ImmutableSandboxedEnvironment in there so I wasn't sure if I should.