FEAT: enable boolean parsing for '0' and '1' values

Author: scottenock

base.d.ts

@@ -276,15 +276,17 @@ export type ParseOptions = {
 
 	@example
 	Force `flagged` to be parsed as a boolean even when `parseBooleans` is false:
-	````
-	queryString.parse('?isAdmin=true&flagged=true', {
+	```
+	queryString.parse('?isAdmin=true&flagged=true&isOkay=0', {
 			parseBooleans: false,
 			types: {
 					flagged: 'boolean',
+					isOkay: 'boolean',
 			},
 	});
-	//=> { isAdmin: 'true', flagged: true }
-	````
+	//=> { isAdmin: 'true', flagged: true, isOkay: false }
+	```
+	Note: The 'boolean' type will also convert "0" and "1" string values to booleans.
 	*/
 	readonly types?: Record<
 	string,

base.js

@@ -313,6 +313,10 @@ function parseValue(value, options, type) {
 		return value.toLowerCase() === 'true';
 	}
 
+	if (type === 'boolean' && value !== null && (value.toLowerCase() === '1' || value.toLowerCase() === '0')) {
+		return value.toLowerCase() === '1';
+	}
+
 	if (type === 'string[]' && options.arrayFormat !== 'none' && typeof value === 'string') {
 		return [value];
 	}

readme.md

@@ -207,15 +207,18 @@ Supported Types:
 - `'boolean'`: Parse `flagged` as a boolean (overriding the `parseBooleans` option):
 
 ```js
-queryString.parse('?isAdmin=true&flagged=true', {
-        parseBooleans: false,
-        types: {
-                flagged: 'boolean',
-        },
+queryString.parse('?isAdmin=true&flagged=true&isOkay=0', {
+		parseBooleans: false,
+		types: {
+				flagged: 'boolean',
+				isOkay: 'boolean',
+		},
 });
-//=> { isAdmin: 'true', flagged: true }
+//=> { isAdmin: 'true', flagged: true, isOkay: false }
 ```
 
+Note: The 'boolean' type will also convert "0" and "1" string values to booleans.
+
 - `'string'`: Parse `phoneNumber` as a string (overriding the `parseNumbers` option):
 
 ```js

test/parse.js

@@ -579,3 +579,16 @@ test('types option: can parse boolean when parseboolean is false', t => {
 		a: true,
 	});
 });
+
+test('types option: boolean type accepts 1 and 0 as boolean values', t => {
+	t.deepEqual(queryString.parse('a=1&b=0', {
+		parsebooleans: false,
+		types: {
+			a: 'boolean',
+			b: 'boolean'
+		},
+	}), {
+		a: true,
+		b: false,
+	});
+});