Constructor allows conversion from dynamic extent to static size.

[T-Bakker]

Hi, a constructor in the nonstd::span allows implicit conversion from a nonstd::span<T, dynamic_extent> to nonstd::span<T, N>:

span-lite/include/nonstd/span.hpp

Line 1159 in 5ac676a

(Extent == dynamic_extent || OtherExtent == dynamic_extent || Extent == OtherExtent)

I believe this is not desired as nothing guarantees that the dynamic span has the correct size. I believe the code should be:
(Extent == dynamic_extent || Extent == OtherExtent)

This only allows conversion if this is dynamic_extent or if the sizes match. Conversions from dynamic_extent to static are no longer allowed.

[martinmoene]

@T-Bakker thanks for the heads-up.