chore: apply final review polish for testing and regex helpers

Agent-Logs-Url: https://github.com/githubnext/tsessebe/sessions/f96fdffc-2f52-41e9-87fb-6f5a8da2917e

Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>

Author: Copilot

src/stats/str_findall.ts

@@ -51,6 +51,7 @@ function makeGlobal(pat: string | RegExp, flags?: string): RegExp {
   return new RegExp(pat, f);
 }
 
+/** Extract named capture-group identifiers from a regex source pattern. */
 function extractNamedGroupNames(source: string): string[] {
   const names: string[] = [];
   const re = /\(\?<([A-Za-z_]\w*)>/g;

src/testing/testing.ts

@@ -50,15 +50,15 @@ function scalarsEqual(
   if (isNull_(a) !== isNull_(b)) {
     return false;
   }
+  if (a === b) {
+    return true;
+  }
   if (isNaN_(a) && isNaN_(b)) {
     return true;
   }
   if (isNaN_(a) !== isNaN_(b)) {
     return false;
   }
-  if (a === b) {
-    return true;
-  }
   if (a instanceof Date && b instanceof Date) {
     return a.getTime() === b.getTime();
   }