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UnsafeFromPrimitive ignores default/alternatives #112

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merged 3 commits into from Mar 25, 2023

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illicitonion
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Previously it would fail to derive, but there are valid use-cases for wanting to perform the unsafe conversion for known "natural" values.

This potentially opens up a bit of confusion around what the behaviours are when these attributes are present but ignored, but these are also documented, and if someone is reaching for this unsafe function rather than using {,Try}FromPrimitive or just an as cast, presumably they're paying attention...

Fixes #32

@illicitonion
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I'm not sure this is a positive change, but am open to discussion...

Previously it would fail to derive, but there are valid use-cases for
wanting to perform the unsafe conversion for known "natural" values.

This potentially opens up a bit of confusion around what the behaviours
are when these attributes are present but ignored, but these are also
documented, and if someone is reaching for this unsafe function rather
than using `{,Try}FromPrimitive` or just an `as` cast, presumably
they're paying attention...
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@danielhenrymantilla danielhenrymantilla left a comment

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I think that with the added documentation it should be fine, yeah ✅.

  • (Although I almost wish the from_unchecked() function were renamed to transmute_from at that point, just to be extra clear. Not something I am seriously suggesting, just something that we could keep on the back of our mind before a 1.0 release, for instance 🙂)

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illicitonion and others added 2 commits March 20, 2023 00:28
Co-authored-by: Daniel Henry-Mantilla <daniel.henry.mantilla@gmail.com>
@illicitonion illicitonion merged commit e02abdc into main Mar 25, 2023
@illicitonion illicitonion deleted the unsafe-ignores-attr branch March 25, 2023 10:35
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Why no alternative and default for UnsafeFromPrimitive ?
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