Use === instead of ==, even where an explicit String cast is required.

Author: cscott

src/css/Properties.js

@@ -172,7 +172,7 @@ var Properties = {
             valid = ValidationTypes.isAny(expression, simple);
             if (!valid) {
 
-                if (expression.peek() == "/" && count > 0 && !slash) {
+                if (String(expression.peek()) === "/" && count > 0 && !slash) {
                     slash = true;
                     max = count + 5;
                     expression.next();

src/css/Validation.js

@@ -86,7 +86,7 @@ var Validation = {
                     result = true;
 
                 } else if (comma) {
-                    if (expression.peek() == ",") {
+                    if (String(expression.peek()) === ",") {
                         part = expression.next();
                     } else {
                         break;
@@ -104,7 +104,7 @@ var Validation = {
                 throw new ValidationError("Expected end of value but found '" + part + "'.", part.line, part.col);
             } else {
                 part = expression.previous();
-                if (comma && part == ",") {
+                if (comma && String(part) === ",") {
                     throw new ValidationError("Expected end of value but found '" + part + "'.", part.line, part.col);
                 } else {
                     throw new ValidationError("Expected (" + types + ") but found '" + value + "'.", value.line, value.col);

src/css/ValidationTypes.js

@@ -97,7 +97,7 @@ var ValidationTypes = {
         },
 
         "<bg-image>": function(part){
-            return this["<image>"](part) || this["<gradient>"](part) ||  part == "none";
+            return this["<image>"](part) || this["<gradient>"](part) ||  String(part) === "none";
         },
 
         "<gradient>": function(part) {
@@ -125,12 +125,12 @@ var ValidationTypes = {
             if (part.type === "function" && /^(?:\-(?:ms|moz|o|webkit)\-)?calc/i.test(part)){
                 return true;
             }else{
-                return part.type === "length" || part.type === "number" || part.type === "integer" || part == "0";
+                return part.type === "length" || part.type === "number" || part.type === "integer" || String(part) === "0";
             }
         },
 
         "<color>": function(part){
-            return part.type === "color" || part == "transparent" || part == "currentColor";
+            return part.type === "color" || String(part) === "transparent" || String(part) === "currentColor";
         },
 
         "<number>": function(part){
@@ -158,7 +158,7 @@ var ValidationTypes = {
         },
 
         "<percentage>": function(part){
-            return part.type === "percentage" || part == "0";
+            return part.type === "percentage" || String(part) === "0";
         },
 
         "<border-width>": function(part){