feat(python): add support for "outer" mode to frame update
method
#11688
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Closes #11684.
We didn't explicitly support
how="outer"
here, but did let it through silently. It would mostly work, except in the edge-case described in the linked issue; this PR now explicitly allows for an "outer" mode, explicitly disallows any join strategy that we don't support inupdate
, and better validates all of the expected behaviour.Also adds more examples and tests, as the various "how" options (outside of the default "left") were either barely tested or not tested at all (and had no supporting examples).