[perl #70676] [BUG] Can not call type conversion methods with .= in Rakudo

[Carl Mäsak]

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<masak> std: my $a; $a .= Int
<p6eval> std 29145: ok 00:02 109m␤
<masak> rakudo: my $a = 5.5; $a .= Int
<p6eval> rakudo 7347ec: .= must have a call on the right hand side at
line 2, near " .= Int" [...]
* masak submits rakuodbug