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Ah ok found it myself,

http://wiki.ros.org/roslaunch/XML/param

Specifies the type of the parameter. If you don't specify the type, roslaunch will attempt to automatically determine the type. These rules are very basic:

  • numbers with '.'s are floating point,
  • integers otherwise;
  • "true" and "false" are boolean (not case-sensitive).
  • all other values are strings