[Issue 18047] std.format value.length modulo seperator step width leads to wrong length

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18047

--- Comment #2 from github-bugzilla at puremagic.com ---
Commit pushed to stable at https://github.com/dlang/phobos

https://github.com/dlang/phobos/commit/aa92422b215c7109bd74bb1cad1226654b7b6f3b
Merge pull request #5911 from burner/issue_17459_issue18047

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