double Config_GetDouble(double defaultValue,
const char *fmt, ...) PRINTF_DECL(2, 3);
Bool Config_NotSet(const char *fmt, ...) PRINTF_DECL(1, 2);
-void Config_Unset(const char *fmt, ...) PRINTF_DECL(1, 2);
-void Config_UnsetWithPrefix(const char *fmt, ...) PRINTF_DECL(1, 2);
+Bool Config_Unset(const char *fmt, ...) PRINTF_DECL(1, 2);
+Bool Config_UnsetWithPrefix(const char *fmt, ...) PRINTF_DECL(1, 2);
void Config_Set(void *value, int type,
const char *fmt, ...) PRINTF_DECL(3, 4);