Fix option handling bug

Author: kgryte

lib/node_modules/@stdlib/random/base/improved-ziggurat/lib/factory.js

@@ -72,6 +72,7 @@ function factory( options ) {
 	var randn;
 	var state;
 	var seed;
+	var copy;
 	if ( arguments.length ) {
 		if ( !isObject( options ) ) {
 			throw new TypeError( 'invalid argument. Must provide an object. Value: `' + options + '`.' );
@@ -102,26 +103,31 @@ function factory( options ) {
 			}
 		}
 	}
+	copy = ( options && options.copy === false ) ? options.copy : true;
 	if ( state === void 0 ) {
 		if ( randu === void 0 ) {
 			if ( seed === void 0 ) {
-				randi = mt19937();
+				randi = mt19937({
+					'copy': copy
+				});
 			} else {
 				randi = mt19937({
-					'seed': seed
+					'seed': seed,
+					'copy': copy
 				});
 			}
 			randu = randi.normalized;
 		} else {
 			randi = mt19937({
-				'seed': floor( 1.0 + ( UINT32_MAX*randu() ) ) // allows seeding via an externally seeded PRNG
+				'seed': floor( 1.0 + ( UINT32_MAX*randu() ) ), // allows seeding via an externally seeded PRNG
+				'copy': copy
 			});
 			seed = null;
 		}
 	} else {
 		randi = mt19937({
 			'state': state,
-			'copy': ( options.copy === void 0 ) ? true : options.copy
+			'copy': copy
 		});
 		randu = randi.normalized;
 	}