Move [de]serialize() methods to SymbolNode. #1798
Merged
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Reid's recent #1785 inspired me to move the (near) abstract base methods [de]serialize() from Node to SymbolNode, with no ill effect. I think the key was changing the type of RefExpr.node from Node to SymbolNode -- running mypy on itself suggested that this is how it's used, except for one cast that now disappeared!