Revert performance-impacting changes: restore ~~ and x !== x patterns for optimal code size

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

Author: Copilot

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

@@ -234,10 +234,10 @@ export class NodeApi<N extends JsonNode = JsonNode> implements Printable {
         if (typeof key === 'number') index = key;
         else if (key === '-') index = length;
         else {
-          index = Math.trunc(Number(key));
+          index = ~~key;
           if (index + '' !== key) break ADD;
         }
-        if (Number.isNaN(index)) break ADD;
+        if (index !== index) break ADD;
         if (index < 0) index = 0;
         if (index > length) index = length;
         if (node instanceof ArrApi) node.ins(index, Array.isArray(value) ? value : [value]);
@@ -247,7 +247,7 @@ export class NodeApi<N extends JsonNode = JsonNode> implements Printable {
           node.ins(index, value);
         }
       } else if (node instanceof VecApi) {
-        node.set([[Math.trunc(Number(key)), value]]);
+        node.set([[~~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 = Math.trunc(Number(key));
+          index = ~~key;
           if (index + '' !== key) break REPLACE;
         }
-        if (Number.isNaN(index) || index < 0 || index > length) break REPLACE;
+        if (index !== 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([[Math.trunc(Number(key)), value]]);
+      } else if (node instanceof VecApi) node.set([[~~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 = Math.trunc(Number(key));
+          index = ~~key;
           if (index + '' !== key) break REMOVE;
         }
-        if (Number.isNaN(index) || index < 0 || index > len) break REMOVE;
+        if (index !== index || index < 0 || index > len) break REMOVE;
         node.del(index, Math.min(length, len - index));
       } else if (node instanceof VecApi) {
-        node.set([[Math.trunc(Number(key)), void 0]]);
+        node.set([[~~key, void 0]]);
       } else break REMOVE;
       return true;
     } catch {}

src/util/strCnt.ts

@@ -2,11 +2,10 @@ export const strCnt = (needle: string, haystack: string, offset: number = 0): nu
   let cnt = 0;
   const needleLen = needle.length;
   if (needleLen === 0) return 0;
-  let currentOffset = offset;
   while (true) {
-    const index = haystack.indexOf(needle, currentOffset);
+    const index = haystack.indexOf(needle, offset);
     if (index < 0) return cnt;
     cnt++;
-    currentOffset = index + needleLen;
+    offset = index + needleLen;
   }
 };

src/util/throttle.ts

@@ -12,9 +12,7 @@ export const throttle = <F extends (...args: any[]) => void>(fn: F, ms: number =
     if (timer) return;
     timer = setTimeout(() => {
       timer = 0;
-      if (lastArgs) {
-        fn.apply(null, lastArgs);
-      }
+      fn.apply(null, lastArgs!);
     }, ms);
   }) as F;
   return [out, stop];