chore: use FLOAT64_MAX_SAFE_NTH_DOUBLE_FACTORIAL

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/factorial2/README.md

@@ -130,10 +130,10 @@ double out = stdlib_base_factorial2( 3 );
 
 The function accepts the following arguments:
 
--   **x**: `[in] int32_t` input value.
+-   **n**: `[in] int32_t` input value.
 
 ```c
-double stdlib_base_factorial2( const int32_t x );
+double stdlib_base_factorial2( const int32_t n );
 ```
 
 </section>

lib/node_modules/@stdlib/math/base/special/factorial2/include/stdlib/math/base/special/factorial2.h

@@ -31,7 +31,7 @@ extern "C" {
 /**
 * Evaluates the double factorial of `n`.
 */
-double stdlib_base_factorial2( const int32_t x );
+double stdlib_base_factorial2( const int32_t n );
 
 #ifdef __cplusplus
 }

lib/node_modules/@stdlib/math/base/special/factorial2/lib/main.js

@@ -24,11 +24,7 @@ var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var isInteger = require( '@stdlib/math/base/assert/is-integer' );
 var isEven = require( '@stdlib/math/base/assert/is-even' );
 var PINF = require( '@stdlib/constants/float64/pinf' );
-
-
-// VARIABLES //
-
-var MAX_FACTORIAL2 = 301; // TODO: consider extracting as a constant
+var FLOAT64_MAX_SAFE_NTH_DOUBLE_FACTORIAL = require( '@stdlib/constants/float64/max-safe-nth-double-factorial' ); // eslint-disable-line id-length
 
 
 // MAIN //
@@ -63,7 +59,7 @@ function factorial2( n ) {
 	if ( isnan( n ) ) {
 		return NaN;
 	}
-	if ( n >= MAX_FACTORIAL2 ) {
+	if ( n >= FLOAT64_MAX_SAFE_NTH_DOUBLE_FACTORIAL ) {
 		return PINF;
 	}
 	if ( n < 0 || isInteger( n ) === false ) {

lib/node_modules/@stdlib/math/base/special/factorial2/manifest.json

@@ -40,7 +40,8 @@
         "@stdlib/math/base/assert/is-nan",
         "@stdlib/math/base/assert/is-integer",
         "@stdlib/math/base/assert/is-even",
-        "@stdlib/constants/float64/pinf"
+        "@stdlib/constants/float64/pinf",
+        "@stdlib/constants/float64/max-safe-nth-double-factorial"
       ]
     },
     {
@@ -57,7 +58,8 @@
         "@stdlib/math/base/assert/is-nan",
         "@stdlib/math/base/assert/is-integer",
         "@stdlib/math/base/assert/is-even",
-        "@stdlib/constants/float64/pinf"
+        "@stdlib/constants/float64/pinf",
+        "@stdlib/constants/float64/max-safe-nth-double-factorial"
       ]
     },
     {
@@ -74,7 +76,8 @@
         "@stdlib/math/base/assert/is-nan",
         "@stdlib/math/base/assert/is-integer",
         "@stdlib/math/base/assert/is-even",
-        "@stdlib/constants/float64/pinf"
+        "@stdlib/constants/float64/pinf",
+        "@stdlib/constants/float64/max-safe-nth-double-factorial"
       ]
     }
   ]

lib/node_modules/@stdlib/math/base/special/factorial2/src/main.c

@@ -21,10 +21,9 @@
 #include "stdlib/math/base/assert/is_integer.h"
 #include "stdlib/math/base/assert/is_even.h"
 #include "stdlib/constants/float64/pinf.h"
+#include "stdlib/constants/float64/max_safe_nth_double_factorial.h"
 #include <stdint.h>
 
-#define MAX_FACTORIAL2 301
-
 /**
 * Evaluates the double factorial of `n`.
 *
@@ -43,7 +42,7 @@ double stdlib_base_factorial2( const int32_t n ) {
 	if ( stdlib_base_is_nan( n ) ) {
 		return 0.0/0.0; // NaN
 	}
-	if ( n >= MAX_FACTORIAL2 ) {
+	if ( n >= STDLIB_CONSTANT_FLOAT64_MAX_SAFE_NTH_DOUBLE_FACTORIAL ) {
 		return STDLIB_CONSTANT_FLOAT64_PINF;
 	}
 	if ( n < 0 || !stdlib_base_is_integer( n ) ) {