fix: perform explicit copy to avoid unintended argument mutation

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/broadcast-array-except-dimensions/lib/main.js

@@ -83,6 +83,7 @@ var format = require( '@stdlib/string/format' );
 */
 function broadcastArrayExceptDimensions( arr, shape, dims ) { // eslint-disable-line id-length
 	var strides;
+	var idx;
 	var dim;
 	var sh;
 	var st;
@@ -94,10 +95,14 @@ function broadcastArrayExceptDimensions( arr, shape, dims ) { // eslint-disable-
 	var i;
 	var j;
 
-	shape = copy( shape ); // perform a copy to avoid unintended mutation
-	N = shape.length;
+	// Copy input arguments to avoid unintended mutation:
+	shape = copy( shape );
+	idx = copy( dims );
 
+	// Resolve the shape of the input array:
 	sh = getShape( arr, false );
+
+	N = shape.length;
 	M = sh.length;
 	if ( N < M ) {
 		throw new Error( 'invalid argument. Cannot broadcast an array to a shape having fewer dimensions. Arrays can only be broadcasted to shapes having the same or more dimensions.' );
@@ -106,22 +111,22 @@ function broadcastArrayExceptDimensions( arr, shape, dims ) { // eslint-disable-
 	strides = zeros( N );
 
 	// Verify that we've been provided a list of unique dimension indices...
-	dl = dims.length;
-	dims = normalizeIndices( dims, N-1 );
-	if ( dims === null ) {
+	dl = idx.length;
+	idx = normalizeIndices( idx, N-1 );
+	if ( idx === null ) {
 		throw new RangeError( format( 'invalid argument. Third argument contains an out-of-bounds dimension index. Value: [%s].', join( dims, ',' ) ) );
 	}
-	dims.sort();
-	if ( dims.length !== dl ) {
+	idx.sort();
+	if ( idx.length !== dl ) {
 		throw new Error( format( 'invalid argument. Third argument must contain a list of unique dimension indices. Value: [%s].', join( dims, ',' ) ) );
 	}
-	di = dims.length - 1;
+	di = idx.length - 1;
 
 	// Determine the output array strides...
 	st = getStrides( arr, false );
 	for ( i = N-1; i >= 0; i-- ) {
 		j = M - N + i;
-		if ( di >= 0 && dims[ di ] === i ) {
+		if ( di >= 0 && idx[ di ] === i ) {
 			if ( j >= 0 ) {
 				shape[ i ] = sh[ j ];
 				strides[ i ] = st[ j ];