pub const MAX_OFFSET_SLOTS: usize = 256;Expand description
Number of positional-offset slots addressable by Op::MarkOffset and
Op::EmitOffset. Slot indices must be strictly below this bound.
The bound is 256 so the PDF layout candidate can mark one slot per indirect
object (indices 0..=254) while reserving slot 255 for the most recent
classic xref section start. Slot indices remain u8 on the wire.