An obarray is a hash table mapping strings to Symbol.ts. Symbol.intern and
Form.read use an obarray.
(Info-goto-node "(elisp)Creating Symbols")
include sig ... endval sexp_of_t : t ‑> Base.Sexp.tval iter : t ‑> f:(Ecaml.Symbol.t ‑> unit) ‑> unit(describe-function 'mapatoms)(Info-goto-node "(elisp)Creating Symbols")