TUPLE: jis assoc ;
-: ch>jis ( ch tuple -- jis ) assoc>> value-at [ throw-encode-error ] unless* ;
+: ch>jis ( ch tuple -- jis ) assoc>> value-at [ encode-error ] unless* ;
: jis>ch ( jis tuple -- string ) assoc>> at replacement-char or ;
: make-jis ( filename -- jis )