Constant X264_REFRESH_FINER 

const X264_REFRESH_FINER: u32 = _; // 4u32

Quality index steps finer than the session’s own a capped CRF refreshes its coarse blocks at (ledger::BlockLedger::refresh), one past ledger::REFRESH_FINER: refreshing a 720p page of text it coded at quantizer 51, x264 came to 37.7 dB three steps finer, 0.9 dB under the uncapped session’s on one to three slice threads, and to 38.5-38.6 four steps finer, within 0.3 dB of it on any, for 3 % more bytes. The uncapped session’s own picture moves with its slice threads (37.9-38.8 dB) rather than with the quantizers its scroll ends at, which are coarser than the refresh’s (26-29 against 22).