type Size = u16;Expand description
Type used for representing the size of a HeaderMap value.
32,768 is more than enough entries for a single header map. Setting this
limit enables using u16 to represent all offsets, which takes 2 bytes
instead of 8 on 64 bit processors.
Setting this limit is especially beneficial for indices, making it more
cache friendly. More hash codes can fit in a cache line.
You may notice that u16 may represent more than 32,768 values. This is
true, but 32,768 should be plenty and it allows us to reserve the top bit
for future usage.