pub const PTR_BASE: u8 = 128;Expand description
Base code for Ptr(HeapKind::*) arms. Each HeapKind ordinal is
added to PTR_BASE to produce the byte. With HeapKind ordinals 0..=28
today the Ptr-range is 128..=156, well clear of the scalar codes
0..=23 and the SENTINEL = 255.