[issue32590] Proposal: add an "ensure(arg)" builtin for parameter validation

[Steven D'Aprano]

Steven D'Aprano <steve+python at pearwood.info> added the comment:

Since this is intended for argument checking, i.e. testing preconditions, the Eiffel term "require" seems more appropriate.

https://www.eiffel.org/doc/eiffel/ET:%20Design%20by%20Contract%20(tm),%20Assertions%20and%20Exceptions#Preconditions

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