feat: add support for non-string data types

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/assert/is-boolean-data-type/README.md

@@ -42,7 +42,7 @@ var isBooleanDataType = require( '@stdlib/ndarray/base/assert/is-boolean-data-ty
 
 #### isBooleanDataType( value )
 
-Tests if an input `value` is a supported ndarray boolean [data type][@stdlib/ndarray/dtypes].
+Tests if an input value is a supported ndarray boolean [data type][@stdlib/ndarray/dtypes].
 
 ```javascript
 var bool = isBooleanDataType( 'bool' );

lib/node_modules/@stdlib/ndarray/base/assert/is-boolean-data-type/lib/main.js

@@ -24,6 +24,11 @@ var contains = require( '@stdlib/array/base/assert/contains' ).factory;
 var dtypes = require( '@stdlib/ndarray/dtypes' );
 
 
+// VARIABLES //
+
+var isDataType = contains( dtypes( 'boolean' ) );
+
+
 // MAIN //
 
 /**
@@ -74,7 +79,9 @@ var dtypes = require( '@stdlib/ndarray/dtypes' );
 * bool = isBooleanDataType( 'foo' );
 * // returns false
 */
-var isBooleanDataType = contains( dtypes( 'boolean' ) );
+function isBooleanDataType( v ) {
+	return isDataType( String( v ) );
+}
 
 
 // EXPORTS //

lib/node_modules/@stdlib/ndarray/base/assert/is-boolean-data-type/test/test.js

@@ -21,6 +21,7 @@
 // MODULES //
 
 var tape = require( 'tape' );
+var DataType = require( '@stdlib/ndarray/dtype-ctor' );
 var isBooleanDataType = require( './../lib' );
 
 
@@ -38,7 +39,8 @@ tape( 'the function returns `true` if provided a supported ndarray boolean data
 	var i;
 
 	values = [
-		'bool'
+		'bool',
+		new DataType( 'bool' )
 	];
 	for ( i = 0; i < values.length; i++ ) {
 		bool = isBooleanDataType( values[ i ] );
@@ -68,6 +70,8 @@ tape( 'the function returns `false` if not provided a supported ndarray boolean
 		'int8',
 		'generic',
 
+		new DataType( 'generic' ),
+
 		// Unsupported dtypes:
 		'float',
 		'int',