FIX: using 64bit integer in tuple math

so: `(1.1.1 * 2147483648.0) = 255.255.255` and not `0.0.0`

It is not a best fix, because one can use hight enough decimal and fall into negative integer again :-/ But at least something for now.

Related to: Oldes/Rebol-issues#1974

src/core/t-tuple.c

@@ -190,8 +190,8 @@
 	REBYTE	*ap = NULL;
 	REBCNT	len = 0;
 	REBCNT	alen;
-	REBCNT	v;
-	REBINT	a;
+	REBI64	v;
+	REBI64	a;
 	REBDEC	dec;
 
 	value = D_ARG(1);
@@ -205,11 +205,11 @@
 		ASSERT2(vp != NULL, RP_MISC);
 
 		if (IS_INTEGER(arg)) {
-			a = VAL_INT32(arg);
+			a = VAL_INT64(arg);
 			ap = 0;
 		} else if (IS_DECIMAL(arg) || IS_PERCENT(arg)) {
 			dec=VAL_DECIMAL(arg);
-			a = (REBINT)dec;
+			a = (REBI64)dec;
 			ap = 0;
 		} else if (IS_TUPLE(arg)) {
 			ap = VAL_TUPLE(arg);
@@ -219,22 +219,22 @@
 		} else Trap_Math_Args(REB_TUPLE, action);
 
 		for (;len > 0; len--, vp++) {
-			v = *vp;
+			v = (REBI64)*vp;
 			if (ap)
-				a = (REBINT) *ap++;
+				a = (REBI64) *ap++;
 			switch (action) {
 			case A_ADD:	v += a; break;
 			case A_SUBTRACT: v -= a; break;
 			case A_MULTIPLY:
 				if (IS_DECIMAL(arg) || IS_PERCENT(arg))
-					v=(REBINT)(v*dec);
+					v=(REBI64)(v*dec);
 				else
 					v *= a;
 				break;
 			case A_DIVIDE:
 				if (IS_DECIMAL(arg) || IS_PERCENT(arg)) {
 					if (dec == 0.0) Trap0(RE_ZERO_DIVIDE);
-					v=(REBINT)Round_Dec(v/dec, 0, 1.0);
+					v=(REBI64)Round_Dec(v/dec, 0, 1.0);     //@@ https://github.com/Oldes/Rebol-issues/issues/1974
 				} else {
 					if (a == 0) Trap0(RE_ZERO_DIVIDE);
 					v /= a;

src/tests/run-tests.r3

@@ -47,6 +47,7 @@ dt [ ;- delta time
 	wrap load %units/datatype-test.r3
 	wrap load %units/parse-test.r3
 	wrap load %units/task-test.r3
+	wrap load %units/tuple-test.r3
 
 	recycle/torture
 	recycle

src/tests/units/tuple-test.r3

@@ -0,0 +1,25 @@
+Rebol [
+	Title:   "Rebol3 tuple test script"
+	Author:  "Oldes, Peter W A Wood"
+	File: 	 %tuple-test.r3
+	Tabs:	 4
+	Needs:   [%../quick-test-module.r3]
+]
+
+~~~start-file~~~ "TUPLE!"
+
+===start-group=== "tuple"
+	--test-- "tuple divide"
+	;@@ https://github.com/Oldes/Rebol-issues/issues/1974
+	--assert (1.1.1 / 0.1)                   == 10.10.10
+	--assert (1.1.1 / 0.625)                 == 2.2.2        ;because round 1 / 0.625 = 2.0 
+	--assert (1.1.1 / 1.953125E-3)           == 255.255.255
+	--assert (1.1.1 / -1.0)                  == 0.0.0
+	--assert (1.1.1 / 4.656612873077393e-10) == 255.255.255
+
+	--test-- "tuple multiply"
+	--assert (1.1.1 * 2147483648.0)          == 255.255.255
+
+===end-group===
+
+~~~end-file~~~