refactor: resolve dtype string and update documented type

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/binary-reduce-strided1d-dispatch/docs/repl.txt

@@ -72,7 +72,7 @@
     options: Object (optional)
         Function options.
 
-    options.dtype: string (optional)
+    options.dtype: string|DataType (optional)
         Output array data type. Setting this option overrides the output data
         type policy.
 

lib/node_modules/@stdlib/ndarray/base/binary-reduce-strided1d-dispatch/lib/main.js

@@ -193,7 +193,7 @@ function BinaryStrided1dDispatch( table, idtypes, odtypes, policies ) {
 * @param {Options} [options] - function options
 * @param {IntegerArray} [options.dims] - list of dimensions over which to perform a reduction
 * @param {boolean} [options.keepdims=false] - boolean indicating whether the reduced dimensions should be included in the returned ndarray as singleton dimensions
-* @param {string} [options.dtype] - output ndarray data type
+* @param {*} [options.dtype] - output ndarray data type
 * @throws {TypeError} first argument must be an ndarray-like object
 * @throws {TypeError} second argument must be an ndarray-like object
 * @throws {TypeError} options argument must be an object

lib/node_modules/@stdlib/ndarray/base/binary-reduce-strided1d-dispatch/lib/validate.js

@@ -43,7 +43,7 @@ var format = require( '@stdlib/string/format' );
 * @param {Options} options - function options
 * @param {boolean} [options.keepdims] - boolean indicating whether the reduced dimensions should be included in the returned ndarray as singleton dimensions
 * @param {IntegerArray} [options.dims] - list of dimensions over which to perform a reduction
-* @param {string} [options.dtype] - output ndarray data type
+* @param {*} [options.dtype] - output ndarray data type
 * @returns {(Error|null)} null or an error object
 *
 * @example
@@ -85,7 +85,7 @@ function validate( opts, ndims, dtypes, options ) {
 	}
 	if ( hasOwnProp( options, 'dtype' ) ) {
 		opts.dtype = options.dtype;
-		if ( !contains( dtypes, opts.dtype ) ) {
+		if ( !contains( dtypes, String( opts.dtype ) ) ) {
 			return new TypeError( format( 'invalid option. `%s` option must be one of the following: "%s". Option: `%s`.', 'dtype', join( dtypes, '", "' ), opts.dtype ) );
 		}
 	}