A type alias allows the same key to be defined multiple times

[alessiosantangelo]

Hi, we experienced an issue using Elm in production which breaks IE 11.
It seems that Elm allows the same key to be defined multiple times inside the same "piece" of model.
E.g.

type alias Save =
    { code : Id
    , totalPrice : Amount
    , hasDiscount : Bool
    , hasFranchigia : Bool
    , hasFranchigiaSoisy : Bool
    , canBeBooked : Bool
    , coverages : List Coverage
    , contractor : Contractor
    , conventionDiscount : Maybe ConventionDiscount
    , hasEarlyDiscount : Bool
    , hasPressureDiscount : Bool
    , hasFranchigia : Bool
    , colorCase : ColorCase
    }

The hasFranchigia
is used two times inside the same type.
The compilers does not throw any error or warning, but the Javascript Strict Mode doesn't allow multiple instances of the same key in the same object.

Probably this is not a problem of Elm itself, but I would share it with you.
Thanks,
Alessio

[process-bot]

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[process-bot]

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

[lukewestby]

Hey @alessiosantangelo,

Probably this is not a problem of Elm itself, but I would share it with you.

this looks like something that we would want to address. Since this issue has to do with the compiler
I'm going to close it here and would you mind reopening on https://github.com/elm-lang/elm-compiler? A simple copy-and-paste into an issue over there would be great.

Thanks!

[lukewestby]

Hey @alessiosantangelo,

Probably this is not a problem of Elm itself, but I would share it with you.

this looks like something that we would want to address. Since this issue has to do with the compiler
I'm going to close it here and would you mind reopening on https://github.com/elm-lang/elm-compiler? A simple copy-and-paste into an issue over there would be great.

Thanks!