Follow-up Comment #5, bug #24135 (project freeciv):
> a longstanding latent issue
Not necessarily. For optimization reasons the semantics of the extremely often
called is_valid_dir() was changed. Previously directions falling outside of
the valid range were also handled there (returning that such a direction is
NOT valid). Now it assumes (with the assert(), when asserts enabled) that
caller knows not to pass direction8_invalid() to it.
Maybe 2.5.2 solution is to replace the assert with a normal check and
returning FALSE for invalid ones?
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