I'm building a static analyzer for Solidity in F# and the data shape of Solidity AST nodes overlaps frequently enough that explicitly specifying types is necess

I'm building a static analyzer for Solidity in F# and the data shape of Solidity AST nodes overlaps frequently enough that explicitly specifying types is necessary just to get things to compile. I can't imagine building something like this in a dynamically typed language. The way I see it, static typing is like writing inline unit tests to save yourself many, many headaches later.