test: add explanatory comments for high tolerance rationale

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Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/hyp2f1/test/test.native.js

@@ -175,6 +175,8 @@ tape( 'the function correctly evaluates the hypergeometric function', opts, func
 			continue;
 		}
 		delta = abs( v - expected[ i ] );
+
+		// NOTE: the tolerance here is larger than for the JavaScript implementation due to compiler optimizations which may be performed resulting in result divergence. For discussion, see https://github.com/stdlib-js/stdlib/pull/2298#discussion_r1624765205
 		tol = 1.2 * EPS * abs( expected[ i ] );
 		t.ok( delta <= tol, 'within tolerance. a: ' + a[ i ] + ' b: ' + b[ i ] + ' c: ' + c[ i ] + ' x: ' + x[ i ] + '. Value: ' + v + '. Expected: ' + expected[ i ] + '. Delta: ' + delta + '. Tolerance: ' + tol + '.' );
 	}
@@ -205,6 +207,8 @@ tape( 'the function correctly evaluates the hypergeometric function', opts, func
 			continue;
 		}
 		delta = abs( v - expected[ i ] );
+
+		// NOTE: the tolerance here is larger than for the JavaScript implementation due to compiler optimizations which may be performed resulting in result divergence. For discussion, see https://github.com/stdlib-js/stdlib/pull/2298#discussion_r1624765205
 		tol = 24.0 * EPS * abs( expected[ i ] );
 		t.ok( delta <= tol, 'within tolerance. a: ' + a[ i ] + ' b: ' + b[ i ] + ' c: ' + c[ i ] + ' x: ' + x[ i ] + '. Value: ' + v + '. Expected: ' + expected[ i ] + '. Delta: ' + delta + '. Tolerance: ' + tol + '.' );
 	}
@@ -235,6 +239,8 @@ tape( 'the function correctly evaluates the hypergeometric function', opts, func
 			continue;
 		}
 		delta = abs( v - expected[ i ] );
+
+		// NOTE: the tolerance here is larger than for the JavaScript implementation due to compiler optimizations which may be performed resulting in result divergence. For discussion, see https://github.com/stdlib-js/stdlib/pull/2298#discussion_r1624765205
 		tol = 32.0 * EPS * abs( expected[ i ] );
 		t.ok( delta <= tol, 'within tolerance. a: ' + a[ i ] + ' b: ' + b[ i ] + ' c: ' + c[ i ] + ' x: ' + x[ i ] + '. Value: ' + v + '. Expected: ' + expected[ i ] + '. Delta: ' + delta + '. Tolerance: ' + tol + '.' );
 	}
@@ -265,6 +271,8 @@ tape( 'the function correctly evaluates the hypergeometric function', opts, func
 			continue;
 		}
 		delta = abs( v - expected[ i ] );
+
+		// NOTE: the tolerance here is larger than for the JavaScript implementation due to compiler optimizations which may be performed resulting in result divergence. For discussion, see https://github.com/stdlib-js/stdlib/pull/2298#discussion_r1624765205
 		tol = 84.0 * EPS * abs( expected[ i ] );
 		t.ok( delta <= tol, 'within tolerance. a: ' + a[ i ] + ' b: ' + b[ i ] + ' c: ' + c[ i ] + ' x: ' + x[ i ] + '. Value: ' + v + '. Expected: ' + expected[ i ] + '. Delta: ' + delta + '. Tolerance: ' + tol + '.' );
 	}
@@ -292,12 +300,7 @@ tape( 'the function correctly evaluates the hypergeometric function', opts, func
 		v = hyp2f1( a[ i ], b[ i ], c[ i ], x[ i ] );
 		delta = abs( v - expected[ i ] );
 
-		/*
-		* NOTE: the tolerance is set high in this case due to:
-		*
-		* 1. The expected values having a very large range, being either very small or very large.
-		* 2. The function making a large number of internal calls, leading to accumulated numerical errors.
-		*/
+		// NOTE: the tolerance here is larger than for the JavaScript implementation due to compiler optimizations which may be performed resulting in result divergence. For discussion, see https://github.com/stdlib-js/stdlib/pull/2298#discussion_r1624765205
 		tol = 345877.0 * EPS * abs( expected[ i ] );
 		t.ok( delta <= tol, 'within tolerance. a: ' + a[ i ] + ' b: ' + b[ i ] + ' c: ' + c[ i ] + ' x: ' + x[ i ] + '. Value: ' + v + '. Expected: ' + expected[ i ] + '. Delta: ' + delta + '. Tolerance: ' + tol + '.' );
 	}