"Symbols are very common in dynamically-typed languages. In Haskell, some of the usage of symbols is subsumed by parsing directly into datatypes with statically-known field / variant names, or sometimes singleton-based ‘known-at-compile-time’ string constants that also happen to be called symbols...." https://discourse.haskell.org/t/symbolize-1-0-1-0-efficient-string-interning-global-symbol-table-with-garbage-collection/11426