refactor: remove unneeded isnan checks across stats/base/dists/discrete-uniform/*

Propagates fix from 80a434f ("refactor: remove unneeded `isnan`
checks") to the discrete-uniform sibling distribution: removes the
redundant `isnan( a )` / `isnan( b )` clauses (and their `is-nan`
require) from mean, variance, entropy, kurtosis, skewness, stdev, and
median. `!isInteger( a )` / `!isInteger( b )` already short-circuit to
`return NaN` for NaN inputs, so the `isnan` calls are dead code.

Author: claude

lib/node_modules/@stdlib/stats/base/dists/discrete-uniform/entropy/lib/main.js

@@ -21,7 +21,6 @@
 // MODULES //
 
 var isInteger = require( '@stdlib/math/base/assert/is-integer' );
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var ln = require( '@stdlib/math/base/special/ln' );
 
 
@@ -64,8 +63,6 @@ var ln = require( '@stdlib/math/base/special/ln' );
 */
 function entropy( a, b ) {
 	if (
-		isnan( a ) ||
-		isnan( b ) ||
 		!isInteger( a ) ||
 		!isInteger( b ) ||
 		a > b

lib/node_modules/@stdlib/stats/base/dists/discrete-uniform/kurtosis/lib/main.js

@@ -20,7 +20,6 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var isInteger = require( '@stdlib/math/base/assert/is-integer' );
 var pow = require( '@stdlib/math/base/special/pow' );
 
@@ -65,8 +64,6 @@ var pow = require( '@stdlib/math/base/special/pow' );
 function kurtosis( a, b ) {
 	var n2;
 	if (
-		isnan( a ) ||
-		isnan( b ) ||
 		!isInteger( a ) ||
 		!isInteger( b ) ||
 		a > b

lib/node_modules/@stdlib/stats/base/dists/discrete-uniform/mean/lib/main.js

@@ -20,7 +20,6 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var isInteger = require( '@stdlib/math/base/assert/is-integer' );
 
 
@@ -63,8 +62,6 @@ var isInteger = require( '@stdlib/math/base/assert/is-integer' );
 */
 function mean( a, b ) {
 	if (
-		isnan( a ) ||
-		isnan( b ) ||
 		!isInteger( a ) ||
 		!isInteger( b ) ||
 		a > b

lib/node_modules/@stdlib/stats/base/dists/discrete-uniform/median/lib/main.js

@@ -20,7 +20,6 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var isInteger = require( '@stdlib/math/base/assert/is-integer' );
 
 
@@ -63,8 +62,6 @@ var isInteger = require( '@stdlib/math/base/assert/is-integer' );
 */
 function median( a, b ) {
 	if (
-		isnan( a ) ||
-		isnan( b ) ||
 		!isInteger( a ) ||
 		!isInteger( b ) ||
 		a > b

lib/node_modules/@stdlib/stats/base/dists/discrete-uniform/skewness/lib/main.js

@@ -20,7 +20,6 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var isInteger = require( '@stdlib/math/base/assert/is-integer' );
 
 
@@ -63,8 +62,6 @@ var isInteger = require( '@stdlib/math/base/assert/is-integer' );
 */
 function skewness( a, b ) {
 	if (
-		isnan( a ) ||
-		isnan( b ) ||
 		!isInteger( a ) ||
 		!isInteger( b ) ||
 		a > b

lib/node_modules/@stdlib/stats/base/dists/discrete-uniform/stdev/lib/main.js

@@ -20,7 +20,6 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var isInteger = require( '@stdlib/math/base/assert/is-integer' );
 var pow = require( '@stdlib/math/base/special/pow' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
@@ -70,8 +69,6 @@ var SQRT1O12 = sqrt( 1.0/12.0 );
 */
 function stdev( a, b ) {
 	if (
-		isnan( a ) ||
-		isnan( b ) ||
 		!isInteger( a ) ||
 		!isInteger( b ) ||
 		a > b

lib/node_modules/@stdlib/stats/base/dists/discrete-uniform/variance/lib/main.js

@@ -20,7 +20,6 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var isInteger = require( '@stdlib/math/base/assert/is-integer' );
 var pow = require( '@stdlib/math/base/special/pow' );
 
@@ -64,8 +63,6 @@ var pow = require( '@stdlib/math/base/special/pow' );
 */
 function variance( a, b ) {
 	if (
-		isnan( a ) ||
-		isnan( b ) ||
 		!isInteger( a ) ||
 		!isInteger( b ) ||
 		a > b