support large byte arrays, using multiple "chunks"; support incremental builder; clarified "limit" (valid >= 0) vs. "hint" (valid > 0); clarified byte access: prefer unchecked acces and iterators internally;

clarified File.eq_content, following 306f273c91ec;

tuned;

clarified hash and equality: depend on sha1 digest to be collision-free;

clarified signature;

tuned source structure;

tuned signature;