Keep track of optional parameters #1224
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Motivation
Step towards #899
Start keeping track of optional method parameters.
Implementation
Pretty clean, just started handling the optionals in the parameters node.
Note: we are not storing the default value of the parameter yet, but we may want to do so in the future. Especially when we have a reaching definitions implementation, we may be able to provide better type inference if we know the default values.
Automated Tests
Added a test.