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$ perl -Mstrict -wE 'my $str = "[]"; say $str == "[]" ? 1 : 0'
Argument "[]" isn't numeric in numeric eq (==) at -e line 1.
Argument "[]" isn't numeric in numeric eq (==) at -e line 1.
1

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$ perl -Mstrict -wE 'my $str = "42"; say $str == "[]" ? 1 : 0'
Argument "[]" isn't numeric in numeric eq (==) at -e line 1.
0