Integer OverflowException when deserializing an int64 whose value is too large to fit in an int32

Hi,

I have an OpenApi schema whose return types include some Integer type fields that have a format of int64. The Hawaii code generator generates client properties of type int64, but if I try to call the server function and it returns a value which is too large to fit in an int32, then I get this:

I had a go at debugging it and I think the error comes from

https://github.com/Zaid-Ajaj/Fable.Remoting/blob/ea1a681100bcfcb02accf81e1fcad6899e7d1a32/Fable.Remoting.Json/FableConverter.fs#L452

where it tries to convert the JSON value into an int, before upcasting to a (u)int64 (and then fails if the value is too large for an int32)?

It actually appears to work ok if the target client property is an Option<int64> rather than a plain int64 (different code paths in the json converter I think?).

Fwiw, I actually fell over this while having a look at making Snowflaqe understand custom ‘Long’ types (ref https://github.com/Zaid-Ajaj/Snowflaqe/issues/8#issuecomment-863949647) and then tried in Hawaii as well (given that int64 is part of the main spec here, where it’s an extension in GraphQl)

[Zaid-Ajaj]

Should be fixed in v0.29 can you give a try and confirm the fix?

[Zaid-Ajaj]

Yeah I was fixing it while listening to .NET docs in the background xD