fix: check for duplicate indices

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/includes/lib/validate.js

@@ -73,6 +73,9 @@ function validate( opts, ndims, options ) {
 		if ( tmp === null ) {
 			return new RangeError( format( 'invalid option. `%s` option contains an out-of-bounds dimension index. Option: [%s].', 'dims', join( opts.dims, ',' ) ) );
 		}
+		if ( tmp.length !== opts.dims.length ) {
+			return new Error( format( 'invalid option. `%s` option contains duplicate indices. Option: [%s].', 'dims', join( opts.dims, ',' ) ) );
+		}
 		if ( tmp.length > ndims ) {
 			return new RangeError( format( 'invalid option. `%s` option specifies more dimensions than exists in the input array. Number of dimensions: %d. Option: [%s].', ndims, join( opts.dims, ',' ) ) );
 		}