On 2018-12-05 14:54, Simon King wrote:
o Mild problem: If there is an external strong reference to, say,
f, then it is possible that Q becomes garbage collected anyway,
and we would end up with an invalid map.
That is one of the things that I would like to fix: maps and actions
should have strong references to their (co)domains. On the other hand,
the coercions and actions should be sufficiently weakly referenced to
prevent memory leaks but not too weakly referenced to keep them alive
when needed. This will rely on #26811.
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