test: explicitly serialize return value to a string

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/min-signed-integer-dtype/test/test.js

@@ -69,7 +69,7 @@ tape( 'the function returns the minimum ndarray data type for storing a provided
 	];
 	for ( i = 0; i < values.length; i++ ) {
 		actual = minSignedIntegerDataType( values[i] );
-		t.strictEqual( actual, expected[ i ], 'returns expected value when provided '+values[i] );
+		t.strictEqual( String( actual ), expected[ i ], 'returns expected value when provided '+values[i] );
 	}
 	t.end();
 });

lib/node_modules/@stdlib/ndarray/base/min-unsigned-integer-dtype/test/test.js

@@ -59,7 +59,7 @@ tape( 'the function returns the minimum ndarray data type for storing a provided
 	];
 	for ( i = 0; i < values.length; i++ ) {
 		actual = minUnsignedIntegerDataType( values[i] );
-		t.strictEqual( actual, expected[ i ], 'returns expected value when provided '+values[i] );
+		t.strictEqual( String( actual ), expected[ i ], 'returns expected value when provided '+values[i] );
 	}
 	t.end();
 });