bug#54732: 29.0.50; New `function-documentation`

[Lars Ingebrigtsen]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> The patch below lifts this restriction by introducing a new generic
> function `function-documentation` to fetch the docstring of a function,
> which can then be implemented in various different ways depending on the
> OClosure's type.

Makes sense to me.  Perhaps the doc string should also say that the
reason that `function-documentation' exists is to allow specialisation,
and that it should (probably) never be called from code directly,
instead of just saying that `documentation' is preferable:

+  "Extract the raw docstring info from FUNCTION.
+FUNCTION is expected to be a function value rather than, say, a mere symbol.
+It is usually preferable to call `documentation' which will call this
+function as needed."


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