Use global isNaN function

Author: Planeshifter

lib/node_modules/@stdlib/string/format/lib/main.js

@@ -21,7 +21,6 @@
 // MODULES //
 
 var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var formatInteger = require( './format_integer.js' );
 var formatDouble = require( './format_double.js' );
 var tokenize = require( './tokenize.js' );
@@ -32,6 +31,7 @@ var zeroPad = require( './zero_pad.js' );
 // VARIABLES //
 
 var fromCharCode = String.fromCharCode;
+var isnan = isNaN; // NOTE: We use the global `isNaN` function here instead of `@stdlib/math/base/assert/is-nan` to avoid circular dependencies.
 
 
 // MAIN //