[patch]: test for boolean in setarg should include aliases

index.js

@@ -111,7 +111,7 @@ module.exports = function (args, opts) {
 			o = {};
 		}
 		if (o === Array.prototype) { o = []; }
-		if (o[lastKey] === undefined || flags.bools[lastKey] || typeof o[lastKey] === 'boolean') {
+		if (o[lastKey] === undefined || isBooleanKey(lastKey) || typeof o[lastKey] === 'boolean') {
 			o[lastKey] = value;
 		} else if (Array.isArray(o[lastKey])) {
 			o[lastKey].push(value);

test/array.js

@@ -70,3 +70,20 @@ test('auto bool accumulates with auto string', function (t) {
 
 	t.end();
 });
+
+test('declared boolean alias overwrites string', function (t) {
+	// This is very contrived, but test for boolean for overwrite should include aliases.
+	// https://github.com/minimistjs/minimist/issues/31
+	var argv = parse(['-b', 'moo'], {
+		boolean: ['bool'],
+		default: { bool: 'silly' }, // misuse default to get a string value into a boolean option!
+		alias: { bool: 'b' },
+	});
+
+	t.deepEqual(argv, {
+		bool: true, b: true,
+		_: ['moo'],
+	});
+
+	t.end();
+});