ref: a0e26d4f40a3a63f9d33fd1a1f01e23a18ff7e27
dir: /src/read.h/
#pragma once
sl_v sl_read_sexpr(sl_v f, bool ws);
bool sl_read_numtok(const char *tok, sl_v *pval, int base);
// defines which characters are ordinary symbol characters.
// exceptions are '.', which is an ordinary symbol character
// unless it's the only character in the symbol, and '#', which is
// an ordinary symbol character unless it's the first character.
#define symchar(c) (!strchr("()[]{}'\";`,\\| \a\b\f\n\r\t\v", (c)))