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digitalmars.D.bugs - [Issue 21810] New: Check for sortedness in `merge` must not use `==`


          Issue ID: 21810
           Summary: Check for sortedness in `merge` must not use `==`
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P1
         Component: phobos
          Assignee: nobody puremagic.com
          Reporter: arne.ludwig posteo.de

Checking sortedness according to a given predicate must not use `==` operator
because it may not be in accordance with the predicate.

In `std.algorithm.sorting.merge` this is happening which produces an
unjustified error in some cases.

Apr 08 2021