refactor: defensively copy provided dtype arrays

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---

Author: kgryte

lib/node_modules/@stdlib/math/array/tools/unary/lib/main.js

@@ -33,6 +33,7 @@ var odtype = require( '@stdlib/ndarray/base/unary-output-dtype' );
 var empty = require( '@stdlib/array/empty' );
 var dtype = require( '@stdlib/array/dtype' );
 var everyBy = require( '@stdlib/array/base/every-by' );
+var copy = require( '@stdlib/array/base/copy' );
 var format = require( '@stdlib/string/format' );
 var validate = require( './validate.js' );
 
@@ -98,8 +99,8 @@ function Unary( fcn, idtypes, odtypes, policy ) {
 		throw new TypeError( format( 'invalid argument. Fourth argument must be a supported output data type policy. Value: `%s`.', policy ) );
 	}
 	this._fcn = fcn;
-	this._idtypes = idtypes;
-	this._odtypes = odtypes;
+	this._idtypes = copy( idtypes );
+	this._odtypes = copy( odtypes );
 	this._policy = policy;
 	return this;
 }