[Issue 24149] Improve invariant checking with assert

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24149

Bolpat <qs.il.paperinik at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P1                          |P5
                 CC|                            |qs.il.paperinik at gmail.com

--