[Issue 17381] Checked format string is permissive after floating point argument

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17381

b2.temp at gmx.com changed:

           What    |Removed                     |Added
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                 CC|                            |b2.temp at gmx.com
                 OS|Linux                       |All

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