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Stricter Assignability Checks for Overloaded Functions
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## Search Terms
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function overload, assignability
## Suggestion
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When a function has overloads, each with a different number of arguments, subtle bugs can occur.
My suggestion is to have extra assignability checks for overloaded methods/functions.
When assigning `A` to `B` the algorithm should be,
1. Is `A` assignable to `B` under the existing assignability rules?
1. Is `A` an overloaded function/method?
1. If it is not, we are done.
1. If it is, we need more checks,
1. Does the assignable overload of `A` have the same number of arguments as `B`?
1. If it does, we are done. (Right? Maybe?)
1. If it doesn't, find all overloads of `A` with the same number of arguments as `B`
1. Is each overload assignable to `B`? If it isn't, we have a compile-time error
## Use Cases
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What shortcomings exist with current approaches?
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Better type safety. I've been bitten by this behaviour regarding overloaded functions/methods in the past, with far more complicated examples. My general advice to people is to avoid overloads as much as possible/at all cost.
If this hole in the type system is fixed, I may not be so averse to overloads... Or I'll probably find something else to gripe about =x
## Examples
The repro below has the following properties,
+ Each overload has a different number of arguments
+ Each…
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