The sorting key. Default position is 0. If the inputBinding is
associated with an input parameter, then the value of self in the
expression will be the value of the input parameter. Input parameter
defaults (as specified by the InputParameter.default field) must be
applied before evaluating the expression. Expressions must return a
single value of type int or a null.
The sorting key. Default position is 0. If the inputBinding is associated with an input parameter, then the value of self in the expression will be the value of the input parameter. Input parameter defaults (as specified by the InputParameter.default field) must be applied before evaluating the expression. Expressions must return a single value of type int or a null.