Hojun-Cho
a3f3153943
V's vfprintf parsed mods via scanmods but dropped them after parse — vformatfield routed straight to vwriteone (no width / alignment / pad / sign / base / prec honoured). Port the OLD modifier path (fmt.ww: 443-641 rawlen* / formatraw / formatone) into vstream.ww as the v* twins, widen vformatfield to take *mods, and pass &m through vfprintf at the call site. The v* helpers mirror OLD verbatim (compute body identical; vputbytes + (size | io.error) routing replacing putbytes + (i32 | io.closed)); shared compute helpers (signof / digitsu64 / basenum) and modifier enums (neg / alignment / mods) are reused directly from fmt.ww via package scope. fmt.ww UNCHANGED — fold-eFinal (#50) collapses both surfaces and dedupes the rawlen-family. drew NaN/Inf signoff: strconv.f64tos / f32tos already render "nan"/"infinity" with no leading '-', so the sign-peel in vrawlenf64 + vformatraw f64 arm is a no-op on those views (same OLD path at fmt.ww:520-562). ken cs==ww mechanical: both stages compile the new V-side identically; 990-997 byte-id gates + combined_ww_fresh stay green (fmt is not embedded in any selfhost main.combined.ww — grep verified pre-impl). test/wcc/780_fmt_vstream_mods_run.c (cstage-only per #209): 5 rows covering width / precision / base_hex / sign_plus / zero_pad. STAGE_WW blocked by #209 (wwstage formattable match-arm bail), same carve-out as 777_fmt_vstream_run.