Explicitly accept a comparison between NAN and true

Author: Girgias

Zend/zend_operators.c

@@ -2405,7 +2405,11 @@ ZEND_API int ZEND_FASTCALL zend_compare(zval *op1, zval *op2) /* {{{ */
 						(Z_TYPE_P(op1) == IS_DOUBLE && zend_isnan(Z_DVAL_P(op1)))
 						|| (Z_TYPE_P(op2) == IS_DOUBLE && zend_isnan(Z_DVAL_P(op2)))
 					) {
-						return 1;
+						/* Fallback when explicitly comparing against true */
+						if (UNEXPECTED(Z_TYPE_P(op1) == IS_TRUE || Z_TYPE_P(op2) == IS_TRUE)) {
+							return 0;
+						}
+						return ZEND_UNCOMPARABLE;
 					}
 					if (Z_TYPE_P(op1) < IS_TRUE) {
 						return zval_is_true(op2) ? -1 : 0;