The important feature of constants is that they are inlined during the compile time, unlike Readonly. Interestingly,
"${ \CONSTANT }"
still inlines the value, but not the reference and dereference:
$ perl -Mconstant=ABC,42 -MO=Deparse -e 'print ABC, "${\ABC}"' print '42', "${\'42';}";
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The important feature of constants is that they are inlined during the compile time, unlike Readonly. Interestingly,
still inlines the value, but not the reference and dereference: