Determine the value given the stripped inline remainder after a mapping colon (or after a sequence dash), plus the current block's indent level.

Count leading ASCII space bytes.

lstrip ASCII whitespace, returning a plain String. Only advances through single-byte ASCII space/tab characters, so the first non-whitespace byte is always a valid character boundary.

Find the indent of the next non-blank non-comment line without advancing.

Return (indent::Int, content::String) for a raw line. content is the line with leading spaces removed, as a proper String.

Strip trailing inline comment (' # ...') and trailing whitespace. Always returns a plain String; uses only byte-level ops.

Return the suffix of s starting one character after byte-position byte_pos. byte_pos must point to the start of a character (i.e. be a valid index). Uses nextind to step one character, then slices to end.