Re: [PATCH] Add some documentation on how to call internal functions

[Florents Tselai]

Here's a v2
- note on NULL args/returns
- ref PointerGetDatum
- used your example. Started adding some comments but don't think they're
really necessary. The reader gets the point as-is I think.

v2-0001-Add-some-documentation-on-how-to-call-internal-fu.patch
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v2-0002-Add-note-on-NULL.-Update-example-to-use-text.patch

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