std: eliminate pointless meta.assumeSentinel() usage #14418
Merged
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This fixes a bug in std.net caused during the introduction of meta.assumeSentinel due to the unfortunate semantics of mem.span()
This leaves only 3 remaining uses of meta.assumeSentinel() in the standard library, each of which could be a simple @ptrCast([*:0]T, foo) instead. I think this function should likely be removed.
See also #14383, #14417