pfx

# CHANGELOG

# 0.4.0
- add `Pfx.eui64_encode/1` to create a modified EUI-64 from a EUI-48 address
- add `Pfx.eui64_decode/1` to create a EUI-48 from a modified EUI-64 address
- fix so that `Pfx.new/1` and `Pfx.from_mac/1` also parse EUI-64 in Cisco's dot format
- fix so teredo_decode mirrors the representation for server/client to its pfx argument
- add Pfx.flip,    flip a single bit in bitstring
- add Pfx.insert,  insert some bits into bitstring
- add Pfx.remove,  remove some bits from bitstring
- TODO:
  - functions raise their own exceptions when marshalling (instead of new/1), like remove/3

# 0.3.0
- added `Pfx.keep/2` to keep some msb bits
- fixed `String.Chars` for MAC addresses with maxlen 48 (w/ hyphens)
- added `String.Chars` for MAC addresses with maxlen 64 (w/ hyphens)
- EUI-48 is now understood by `Pfx.new/1`
- EUI-64 is now understood by `Pfx.new/1`, if using hyphens
- added `Pfx.from_mac/1` to support EUI-64 with ":"'s
- `String.Chars` no longer accepts invalid %Pfx structs
- `Pfx.format/2` without `opts`, uses same defaults as `String.Chars`

# 0.2.1
- `Pfx.marshall/2` is now a public function
- renamed `Pfx.teredo` to `Pfx.teredo_decode/1`

# 0.2.0
- added `Pfx.teredo_encode/4`

# 0.1.2
- added `Pfx.drop/2`, which drops some lsb bits
- improved documentation

# 0.1.1
- fixed `Pfx.brot/2`, rotating empty `pfx.bits`
- fixed `Pfx.band/2`, result has same number of bits as its first argument
- fixed `Pfx.bor/2`, result has same number of bits as its first argument
- fixed `Pfx.bxor/2`, result has same number of bits as its first argument
- fixed `Pfx.contrast/2`, 1.2.3.0/24 is really to the left of 1.2.4.0/24
- IPv6 addresses in lowercase

# 0.1.0
- initial version