fix: ensure valid indexing of arguments array

lib/node_modules/@stdlib/utils/mask-arguments/lib/main.js

@@ -148,7 +148,7 @@ function maskArguments( fcn, mask, thisArg ) {
 		var i;
 
 		args = [];
-		for ( i = 0; i < arguments.length; i++ ) {
+		for ( i = 0; i < idx.length; i++ ) {
 			args.push( arguments[ idx[i] ] );
 		}
 		return fcn.apply( thisArg, args );

lib/node_modules/@stdlib/utils/mask-arguments/test/test.js

@@ -234,6 +234,42 @@ tape( 'the returned function invokes a function according to an argument mask (n
 	}
 });
 
+tape( 'the returned function only forwards the masked-in arguments when called with more arguments than mask entries (nary)', function test( t ) {
+	var bar = maskArguments( foo, [ 1, 1, 1, 1, 1, 1 ] );
+
+	t.deepEqual( bar( 1, 2, 3, 4, 5, 6, 7, 8 ), [ 6, 1, 2, 3, 4, 5, 6 ], 'returns expected value' );
+	t.end();
+
+	function foo() {
+		var args;
+		var i;
+
+		args = [ arguments.length ];
+		for ( i = 0; i < arguments.length; i++ ) {
+			args.push( arguments[ i ] );
+		}
+		return args;
+	}
+});
+
+tape( 'the returned function forwards the masked-in arguments when called with fewer arguments than mask entries (nary)', function test( t ) {
+	var bar = maskArguments( foo, [ 1, 1, 1, 1, 1, 1 ] );
+
+	t.deepEqual( bar( 1, 2, 3 ), [ 6, 1, 2, 3, void 0, void 0, void 0 ], 'returns expected value' );
+	t.end();
+
+	function foo() {
+		var args;
+		var i;
+
+		args = [ arguments.length ];
+		for ( i = 0; i < arguments.length; i++ ) {
+			args.push( arguments[ i ] );
+		}
+		return args;
+	}
+});
+
 tape( 'the function supports providing a `this` context', function test( t ) {
 	var ctx;
 	var bar;

lib/node_modules/@stdlib/utils/pick-arguments/lib/main.js

@@ -148,7 +148,7 @@ function pickArguments( fcn, indices, thisArg ) {
 		var i;
 
 		args = [];
-		for ( i = 0; i < arguments.length; i++ ) {
+		for ( i = 0; i < idx.length; i++ ) {
 			args.push( arguments[ idx[i] ] );
 		}
 		return fcn.apply( thisArg, args );

lib/node_modules/@stdlib/utils/pick-arguments/test/test.js

@@ -236,6 +236,42 @@ tape( 'the returned function invokes a function with specified arguments (nary)'
 	}
 });
 
+tape( 'the returned function only forwards the specified number of arguments when called with more arguments than indices (nary)', function test( t ) {
+	var bar = pickArguments( foo, [ 0, 1, 2, 3, 4, 5 ] );
+
+	t.deepEqual( bar( 1, 2, 3, 4, 5, 6, 7, 8 ), [ 6, 1, 2, 3, 4, 5, 6 ], 'returns expected value' );
+	t.end();
+
+	function foo() {
+		var args;
+		var i;
+
+		args = [ arguments.length ];
+		for ( i = 0; i < arguments.length; i++ ) {
+			args.push( arguments[ i ] );
+		}
+		return args;
+	}
+});
+
+tape( 'the returned function forwards the specified number of arguments when called with fewer arguments than indices (nary)', function test( t ) {
+	var bar = pickArguments( foo, [ 0, 1, 2, 3, 4, 5 ] );
+
+	t.deepEqual( bar( 1, 2, 3 ), [ 6, 1, 2, 3, void 0, void 0, void 0 ], 'returns expected value' );
+	t.end();
+
+	function foo() {
+		var args;
+		var i;
+
+		args = [ arguments.length ];
+		for ( i = 0; i < arguments.length; i++ ) {
+			args.push( arguments[ i ] );
+		}
+		return args;
+	}
+});
+
 tape( 'the function supports providing a `this` context', function test( t ) {
 	var ctx;
 	var bar;