Multiple real number options accept base ten numbers with optional fractional components.
Additionally, leading zeros are ignored and numbers can be specified in scientific notation using 'e' syntax.
Multiple numbers are delimited using , or ; or : and the order they are specified in is perserved.
Option set
--switch=0 --switch=1,2,3 --switch=1E3:3.0
The option may also be set an empty list by not specifying a value.
Option set to empty
--switch --switch=