fix: add type check to ensure only options objects are passed to factory

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---

Author: kgryte

lib/node_modules/@stdlib/random/tools/unary-factory/lib/main.js

@@ -172,6 +172,9 @@ function createFactory( prng, idtypes, odtypes, policies, options ) {
 
 		if ( arguments.length > 0 ) {
 			opts = arguments[ 0 ];
+			if ( !isPlainObject( opts ) ) {
+				throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', opts ) );
+			}
 			base = prng.factory( opts );
 		} else {
 			opts = {};