The Msgpax.Packer protocol is responsible for serializing any Elixir data structure according to the MessagePack specification.

Some notable properties of the implementation of this protocol for the built-in Elixir data structures:

• atoms are encoded as strings (i.e., they’re converted to strings first and then encoded as strings)
• bitstrings can only be encoded as long as they’re binaries (and not actual bitstrings - i.e., the number of bits must be a multiple of 8)
• binaries (or Msgpax.Bin structs) containing 2^32 or more bytes cannot be encoded
• maps with more than (2^32) - 1 elements cannot be encoded
• lists with more than (2^32) - 1 elements cannot be encoded
• integers bigger than (2^64) - 1 or smaller than -2^63 cannot be encoded