🚚 refactor: Rename delete_case1 to delete_case0.

The goal is to have case number zero for the base case of the recursion.
I had to do each of these renaming operations individually as otherwise
git would register a consequent amount of churn.

Author: make-github-pseudonymous-again

src/deletion/delete_case1.js renamed to src/deletion/delete_case0.js

@@ -11,7 +11,7 @@ import delete_case2 from './delete_case2.js';
  *
  * @param {Node} n - The input node.
  */
-const delete_case1 = (n) => {
+const delete_case0 = (n) => {
 	assert(n instanceof Node);
 	assert(n._color === BLACK);
 	// If n is the root, there is nothing to do:
@@ -20,4 +20,4 @@ const delete_case1 = (n) => {
 	if (n.parent !== null) delete_case2(n);
 };
 
-export default delete_case1;
+export default delete_case0;

src/deletion/delete_case3.js

@@ -4,7 +4,7 @@ import RED from '../color/RED.js';
 import Node from '../types/Node.js';
 import sibling from '../family/sibling.js';
 
-import delete_case1 from './delete_case1.js';
+import delete_case0 from './delete_case0.js';
 import delete_case4 from './delete_case4.js';
 
 /**
@@ -44,7 +44,7 @@ const delete_case3 = (n) => {
 		(s.right === null || s.right._color === BLACK)
 	) {
 		s._color = RED;
-		delete_case1(n.parent);
+		delete_case0(n.parent);
 	}
 
 	// Otherwise, go to case 4.

src/index.js

@@ -3,7 +3,7 @@ export {default as from} from './api/from.js';
 export {default as BLACK} from './color/BLACK.js';
 export {default as RED} from './color/RED.js';
 export {default as _debug} from './debug/_debug.js';
-export {default as delete_case1} from './deletion/delete_case1.js';
+export {default as delete_case0} from './deletion/delete_case0.js';
 export {default as delete_case2} from './deletion/delete_case2.js';
 export {default as delete_case3} from './deletion/delete_case3.js';
 export {default as delete_case4} from './deletion/delete_case4.js';