On Sun, Jul 5, 2020 at 2:36 PM Federico Salerno <salerno...@gmail.com> wrote:
> On the topic of NaNs: I think in the face of ambiguity, we should refuse > the temptation to guess and raise ValueError when the values given are not > comparable to the point of clearly determining whether `value` is or isn't > within `minimum` and `maximum` or which of the two bounds it exceeds. It is > the programmer's responsibility to ensure they supply arguments that make > sense, and non-numbers should be considered exceptional behaviour: as such, > the programmer that anticipates those kinds of values should handle them > exceptionally. > +1 > About the stdlib/builtin status: `min(max(x, min_), max_)` is a common > enough idiom for a simple enough function that I think it is definitely > beneficial and in no way dangerous to have, and that any status other than > builtin would incur too much overhead for something so small. I risk > claiming that most calls to max() and min() occur in modules that do not > `import math` (or at the very least, they occur often enough without > `import math`), and I believe clamp(), being very similar in scope to > those, should benefit from similar status. > > I don't think clamp is a common enough identifier in non-specific fields > to disqualify its implementation as a builtin by itself. By contrast, terms > like `min` and `max` are extremely common in pretty much all contexts, and > yet we've all survived just fine by typing `min_` and `max_` or even > shadowing the names altogether (which I prefer not to do, but is definitely > an option). > Has anyone suggested a .clamp method on the various numerical classes? Since this is a convenience that's easy to do without or implement yourself, I don't think it's important that it's super general and can instantly be used with anything comparable.
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