Version 2.1.0

• Encoder options with null default value will now be recognized
• The integer encoder will now add an (int) cast in front of integers, if
  their value equals PHP_INT_MAX * -1 - 1.
• If float.integers is set to true, the float encoder will now only encode
  floats as integers if the value is accurately represented by the float. Set
  the value to "all" to restore the previous behavior.
• The float encoder no longer breaks if the PHP locale uses comma as a decimal
  separator.
• The float encoder now behaves slightly differently when deciding whether to
  use the exponential float notation or not.
• The float encoder now uses serialize_precision when the option precision
  is set to false
• Several methods will now throw an InvalidOptionException if any invalid
  encoder options have been provided