309B          ; disallowed_STD3_mapped ; 0020 3099     # 1.1  KATAKANA-HIRAGANA VOICED SOUND MARK
309C          ; disallowed_STD3_mapped ; 0020 309A     # 1.1  KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK
309D..309E    ; valid                                  # 1.1  HIRAGANA ITERATION MARK..HIRAGANA VOICED ITERATION MARK

### Holding multiple locks

You're allowed to take the Http2Connection lock while holding the Http2Writer lock. But not vice-versa. Because taking the Http2Writer lock can block.

            }
            else -> {
              // Ignore an unexpected pong.
            }
          }
        }
      } else {
        // Send a reply to a client ping if this is a server and vice versa.
        writerQueue.execute("$connectionName ping") {
          writePing(true, payload1, payload2)
        }
      }
    }

    override fun goAway(
      lastGoodStreamId: Int,