Both these devs are far too full of themselves to think of using an enum table or anything clever with datatypes themselves.
Because that would mean the way they've been doing things was potentially grossly inefficient at runtime... and they've been doing that for years...
But a narcissist never makes a mistake, so instead, here's a bunch of reasons why actually writing optimized code is stupid, first among them being 'well it didn't occur to me, therefore doing it this way would reduce code readability for this code base that only I and no else needs to read'.
I am guessing the concept of a sentinel value or an overloadable function would make their minds implode.
But anyway, 'switch' is 'match' in gdscript:
https://docs.godotengine.org/en/latest/tutorials/scripting/gdscript/gdscript_basics.html#match
match <test value>:
<pattern(s)>:
<block>
<pattern(s)> when <pattern guard>:
<block>
<...>