id summary reporter owner description type status priority milestone component version resolution keywords cc difficulty 1445 Support parameterised hash table type declarations evhan "As suggested by megane on [https://lists.nongnu.org/archive/html/chicken-hackers/2018-02/msg00008.html chicken-hackers]. Support specifying the types of hash table keys and values: {{{ (define t (the (hash-table fixnum symbol) ...)) (hash-table-ref t 'foo) ; warning ""expected argument #2 of type `fixnum' but was given an argument of type `symbol'"" (hash-table-ref t 42) ; result would be known to be a symbol }}} And so on." enhancement new not urgent at all someday scrutinizer 5.0.0 scrutiniser, srfi-69 medium