Shell variables are expanded before the script is run

[gaddman]

When using this plugin shell variables may be expanded before the script is run, depending on the format used.
This will work fine:

#!/usr/bin/env bash

myvar="pickles"
echo "myvar is $myvar"

printing:
myvar is pickles

While this will fail:

#!/usr/bin/env bash

myvar="pickles"
echo "myvar is ${myvar}"

printing:
myvar is

This works fine with the builtin inline script plugin. While the example above is trivial, the second format is used for bash parameter expansions, so those are not possible.