v18.1.2

18.1.2 (2026-10-26)

Bug Fixes

• allow a tab or end of input after a type 6 html block tag name (#4128) (e09c40d)
• apply emphasis flanking and rules 9-10 to the whole delimiter run (#4145) (5d8e234)
• cli: await config functions before parsing (#4138) (3a11ad1)
• cli: create no-clobber output files atomically (#4135) (e7c4f64)
• do not continue a block quote paragraph from a whitespace-only line (#4134) (42f34a8)
• expand a tab after the block quote marker to the next tab stop (#4110) (2d3899b)
• honor per-call async options when composing hooks (#4139) (379be9d)
• keep a line starting with # but no space in the list item (#4127) (6b63189)
• keep duplicate link definitions in the tokens (#4132) (2784acc)
• keep lazy lines after a list in a nested blockquote (#4137) (38c7e55)
• keep lazy setext underlines in list items as text (#4126) (398234c)
• render nested image alt formatting as plain text (#4131) (15f59bb)
• stop an unclosed inline raw tag from unescaping later blocks (#4130) (4562b6f)

Performance Improvements

• ~16% faster parsing by skipping em/strong masking for runs without *, _ or ~ (#4142) (f0fd3e0)