refactor: use assertion utility rather than hardcoded string

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/order/lib/main.js

@@ -20,6 +20,7 @@
 
 // MODULES //
 
+var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
 var strides2order = require( '@stdlib/ndarray/base/strides2order' );
 
 
@@ -52,7 +53,7 @@ function order( x ) {
 	var o;
 
 	o = x.order;
-	if ( typeof o === 'string' ) {
+	if ( isString( o ) ) {
 		return o;
 	}
 	// Try to infer the layout order from the strides array...