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Set by lizmat on 8 June 2022.
Geth rakudo: 02a28de5bd | (Elizabeth Mattijsen)++ | src/core.c/Buf.pm6
Make Blob concatenation always return the left-hand type

Looking back at the history, this goes back until at least 2013 when it was implemented as returning Buf if the types didn't match.
Other Blob related infixes return the type of the left-hand side, so it makes sense to do this for concatentation as well.
In response to #5071
09:24
Geth ¦ rakudo: lizmat self-unassigned Blob ~ parametrized Blob = Buffer github.com/rakudo/rakudo/issues/5071 09:26