v0.4.0

Breaking changes

• Removed the vestigial std feature. Users relying on features = ["std"] should switch to
  features = ["alloc"].
• HexDisplayExt is now a sealed trait: downstream crates can no longer provide their own
  implementations. The new blanket impl for T: AsRef<[u8]> + ?Sized already covers every
  reasonable input.
• HexDisplayExt convenience methods hex_string upper_hex_string renamed to to_hex_string and
  to_upper_hex_string to match preferred Rust naming conventions.
• Hex object now uses explicit Hex::new() constructor instead of providing public fields.
• MSRV raised from 1.56 to 1.74.

Added

• The formatter's width, align, and fill are now honored for the single-line hex output.
• Alternate-form hexdump output: format!("{:#}", bytes.hex()) produces a multiline hexdump -C-style dump with an offset column and ASCII gutter. Combines with the upper-case flag
  ({:#X}) and width/alignment/fill.
• to_hex_dump / to_upper_hex_dump convenience methods on HexDisplayExt, gated on the alloc
  feature, to produce the hexdump as described above but as a string.
• Generic HexDisplayExt implementation for any T: AsRef<[u8]> + ?Sized.

Full Changelog

v0.3.2...v0.4.0