[perl #59382] [BUG] Scalars never give up their container type

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# New Ticket Created by  Moritz Lenz 
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22:35 < moritz_> rakudo: my $a = { a => 42 }; say 1; $a = [ 0 ]; say 2
22:35 < p6eval> rakudo 31446: OUTPUT[1␤Odd number of elements found
where hash
                expected␤current instr.: 'parrot;List;hash' pc 2877
                (src/gen_builtins.pir:1999)␤]
22:38 < moritz_> rakudo: my $a = [0]; say 1; $a = 2; say $a.WHAT
22:38 < p6eval> rakudo 31446: OUTPUT[1␤Array␤]

When a scalar variable holds either an array or or a hash, assigning to
it always forces the LHS into the type of the previous container.

There's a test for that in
t/spec/S02-builtin_data_types/catch_type_cast_mismatch.t which I'll add
to spectest_regression soon.

-- 
Moritz Lenz
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