Improve Plans flexibility

[LaRiffle]

Is your feature request related to a problem? Please describe.
Plans currently don't work exactly as normal function in the following scenarios:

• if some inputs that are not used in the computations
• if some inputs that are not used and are given in the output
• if input/ouput contain nested objects like list or tuple

Describe the solution you'd like
We want to support this by default

[tudorcebere]

I will have a look on this.