Handy guards which you can use in your code to assert correct values.
Summary
Functions
Byte sizes are non negative integers
An integer between 0 and 0x7F
One of :none, :rising, :falling or :both
Either :in or :out
Pin numbers are non negative integers
One of :not_set, :none, :pull_up or :pull_down
Either 0 or 1
Register addresses are non negative integers usually only one byte, but we don't enforce that here
Functions
Byte sizes are non negative integers
An integer between 0 and 0x7F
One of :none, :rising, :falling or :both
Either :in or :out
Pin numbers are non negative integers
One of :not_set, :none, :pull_up or :pull_down
Either 0 or 1
Register addresses are non negative integers usually only one byte, but we don't enforce that here