Method arrayEnsureCapacity

src/lib/json_buffer.ts:1088–1121

(target: Pointer, minCap: number)

  // --- Array Methods Support ---

  private arrayEnsureCapacity(target: Pointer, minCap: number) {
    this.resolvePtr(target.__ptr);
    if (this.scratchCap >= minCap) return;

    const oldCap = this.scratchCap;
    const oldLen = this.scratchLen;
    const oldDataStart = this.scratchStart;

    const newCap = Math.max(oldCap * 2, minCap);
    const newByteSize = 12 + newCap * 8;

    const newPtr = this.alloc(newByteSize);

    // Re-resolve after alloc
    this.resolvePtr(target.__ptr);

    const idx = newPtr >> 2;
    this.u32[idx] = TYPE_ARRAY;
    this.u32[idx + 1] = newCap;
    this.u32[idx + 2] = oldLen;

    // Copy existing data
    this.u8.set(
      this.u8.subarray(oldDataStart, oldDataStart + oldLen * 8),
      newPtr + 12,
    );

    // Mark old as moved
    const pIdx = this.scratchPtr >> 2;
    this.u32[pIdx] = TYPE_MOVED;
    this.u32[pIdx + 1] = newPtr;

    this.resolvePtr(target.__ptr);
  }

  private arraySpliceImpl(
    target: Pointer,