fix: improve type specificity

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/stats/base/ndarray/midrange/docs/types/index.d.ts

@@ -20,7 +20,7 @@
 
 /// <reference types="@stdlib/types"/>
 
-import { ndarray } from '@stdlib/types/ndarray';
+import { typedndarray } from '@stdlib/types/ndarray';
 
 /**
 * Computes the mid-range of a one-dimensional ndarray.
@@ -37,7 +37,7 @@ import { ndarray } from '@stdlib/types/ndarray';
 * var v = midrange( [ x ] );
 * // returns 1.0
 */
-declare function midrange<T extends ndarray = ndarray>( arrays: [ T ] ): number;
+declare function midrange<T extends typedndarray<number> = typedndarray<number>>( arrays: [ T ] ): number;
 
 
 // EXPORTS //