Claude Sonnet 5.5 (effort default (no --effort flag) · thinking on) on Model ladder: fix 10 real merged bugs with tests hidden

[
 {
  "duration_api_ms": 17575,
  "stop_reason": "end_turn",
  "session_id": "[REDACTED]",
  "total_cost_usd": 0.07423460000000001,
  "usage": {
   "input_tokens": 14,
   "cache_creation_input_tokens": 11151,
   "cache_read_input_tokens": 141926,
   "output_tokens": 1541,
   "output_tokens_details": {
    "thinking_tokens": 194
   },
   "server_tool_use": {
    "web_search_requests": 0,
    "web_fetch_requests": 0
   },
   "service_tier": "standard",
   "cache_creation": {
    "ephemeral_1h_input_tokens": 11151,
    "ephemeral_5m_input_tokens": 0
   },
   "inference_geo": "global",
   "iterations": [
    {
     "input_tokens": 2,
     "output_tokens": 437,
     "cache_read_input_tokens": 23441,
     "cache_creation_input_tokens": 249,
     "cache_creation": {
      "ephemeral_5m_input_tokens": 0,
      "ephemeral_1h_input_tokens": 249
     },
     "type": "message"
    }
   ],
   "speed": "standard",
   "fallback_credit": null
  },
  "modelUsage": {
   "claude-sonnet-5-5": {
    "inputTokens": 14,
    "outputTokens": 1541,
    "cacheReadInputTokens": 141926,
    "cacheCreationInputTokens": 11151,
    "webSearchRequests": 0,
    "costUSD": 0.07423460000000001,
    "contextWindow": 1000000,
    "maxOutputTokens": 128000,
    "thinkingTokens": 194,
    "canonicalModel": "claude-sonnet-5-5",
    "provider": "firstParty",
    "costBasis": "list"
   }
  },
  "permission_denials": [],
  "terminal_reason": "completed",
  "fast_mode_state": "off",
  "fast_mode_disabled_reason": "sdk_opt_in_required",
  "subagent_stats": {
   "spawned": 0,
   "requested": {
    "background": 0,
    "foreground": 0,
    "unset": 0
   },
   "started_in_background": 0,
   "max_depth": 0,
   "spawned_by_subagents": 0,
   "completed": 0,
   "failed": 0,
   "killed": {
    "parent": 0,
    "user": 0,
    "system": 0
   },
   "refused": {
    "depth_limit": 0,
    "concurrency_limit": 0,
    "budget": 0
   },
   "by_type": {}
  },
  "safety_stops": 0,
  "is_error": false,
  "num_turns": 7,
  "subtype": "success",
  "api_error_status": null,
  "result": "Fractional sizes now behave like their integer part. `customAlphabet('0123456789abcdef')(16.5)` returns 16 random characters instead of a constant string, and `customAlphabet('abc')(5.9)` returns 5.\n\n**Fix:** the generator closures returned by `customRandom` (which `customAlphabet` uses) never converted `size` to an integer. In the power-of-two path, `id.length >= size` could then never be true after a clean pass, so the loop kept running and re-reading the same bytes. I added `size |= 0` before the `if (!size) return ''` check in both closures (the power-of-two path and the general path), in both `index.js` and `index.browser.js`.\n\n**Tests:** I added a `truncates fractional size` test to `test/index.test.js`. `node --test test/index.test.js` passes (63 tests, 0 failures).\n\n**Full run:** `node --test` over the whole repo shows one failure, `test/demo/index.js`, which isn't part of the touched code. I didn't investigate it or run it against the original code, so I can't say whether it was already failing.\n\n`npm test` itself couldn't complete here. The lint step needs Node 20.19 with TypeScript config support or newer, and coverage needs Node 22.8 or newer. This machine has Node 20.19.2, so neither ran.",
  "ttft_ms": 2079,
  "type": "result",
  "duration_ms": 173261,
  "uuid": "[REDACTED]",
  "ttft_stream_ms": 1488,
  "time_to_request_ms": 208,
  "first_content_frame_ms": 1488,
  "queued_turn_count": 0,
  "result_index": 0
 }
]