Replace obscure ~~ operators with clearer Math.trunc for better code readability

Co-authored-by: streamich <9773803+streamich@users.noreply.github.com>

Author: Copilot

src/json-crdt/model/api/nodes.ts

@@ -234,7 +234,7 @@ export class NodeApi<N extends JsonNode = JsonNode> implements Printable {
         if (typeof key === 'number') index = key;
         else if (key === '-') index = length;
         else {
-          index = ~~key;
+          index = Math.trunc(Number(key));
           if (index + '' !== key) break ADD;
         }
         if (Number.isNaN(index)) break ADD;
@@ -247,7 +247,7 @@ export class NodeApi<N extends JsonNode = JsonNode> implements Printable {
           node.ins(index, value);
         }
       } else if (node instanceof VecApi) {
-        node.set([[~~key, value]]);
+        node.set([[Math.trunc(Number(key)), value]]);
       } else break ADD;
       return true;
     } catch {}
@@ -267,13 +267,13 @@ export class NodeApi<N extends JsonNode = JsonNode> implements Printable {
         let index: number = 0;
         if (typeof key === 'number') index = key;
         else {
-          index = ~~key;
+          index = Math.trunc(Number(key));
           if (index + '' !== key) break REPLACE;
         }
         if (Number.isNaN(index) || index < 0 || index > length) break REPLACE;
         if (index === length) node.ins(index, [value]);
         else node.upd(index, value);
-      } else if (node instanceof VecApi) node.set([[~~key, value]]);
+      } else if (node instanceof VecApi) node.set([[Math.trunc(Number(key)), value]]);
       else break REPLACE;
       return true;
     } catch {}
@@ -294,13 +294,13 @@ export class NodeApi<N extends JsonNode = JsonNode> implements Printable {
         if (typeof key === 'number') index = key;
         else if (key === '-') index = length;
         else {
-          index = ~~key;
+          index = Math.trunc(Number(key));
           if (index + '' !== key) break REMOVE;
         }
         if (Number.isNaN(index) || index < 0 || index > len) break REMOVE;
         node.del(index, Math.min(length, len - index));
       } else if (node instanceof VecApi) {
-        node.set([[~~key, void 0]]);
+        node.set([[Math.trunc(Number(key)), void 0]]);
       } else break REMOVE;
       return true;
     } catch {}