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Raphaël Gomès's avatar
Raphaël Gomès authored
When modifying the API I hit some... interesting errors (trying to allocate
178GB of RAM, for example) because I failed to keep the counters correctly
updated.

This counter underflow is likely to happen when code is changed around
and can have up to eat-your-dirstate level of consequences, which is not nice.

The very small runtime cost of checking these counters should really not be an
issue and will help us uncover bugs when/if they do appear in the future.

Differential Revision: https://phab.mercurial-scm.org/D12430
2593873c
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