Feature request

Feature description

If we try to pass an integer value to a double parameter from the command line or from a parameters YAML file we get a rclcpp::ParameterTypeException. For example, passing a parameter from the command line:

ros2 run foo_package foo_node --ros-args -p foo_arg:=1

results in the following error:

terminate called after throwing an instance of 'rclcpp::ParameterTypeException'
  what():  expected [double] got [integer]

and we can fix it by explicitly making our value a floating point number:

ros2 run foo_package foo_node --ros-args -p foo_arg:=1.0

But, it seems reasonable to me that if a user forgets to explicitly provide a floating point value that we should implicitly cast an integer to a float (as is done in many programming languages).