.NET 4.0 support about deedle HOT 5 CLOSED

I think supporting .NET 4.0 is a fairly reasonable request. Can you submit your change to use ReadOnlyCollection as a pull request (without the DotSetting.user file)?

The library currently depends on the CSV parser (that's okay) and type inference (which is only available in FSharp.Data.DesignTime.dll, because CSV type provider only needs it at design time).

This is a bit silly dependency - I think we need to have an easy way to read CSV files directly in the data frame library (people use this all the time), but we do not really need F# Data, just the CSV parser & inference..

I'm not sure what the best option is - I suppose these might be included in some common shared base data science library (at some point) but for now, we can probably just copy & paste the relevant files (perhaps after some refactoring to make this just a file or two).

Do you need this urgently for some project (or do we have some time to refactor & plan how to best do this)?

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I think we could move the type inference to the runtime component of FSharp.Data. It is being used at runtime here, and nothing there depends on 4.5

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I was also wondering if it would make sense to separate the CSV type inference from the structural type inference (to some extent). They could still share some basic functionality, but the two have quite different nature so perhaps that would make the code more easier to follow/extend/improve.

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Submitted a pull request.

Do you need this urgently for some project (or do we have some time to refactor & plan how to best do this)?
This is not urgent and I could strip away all .csv stuff and 4.5 references myself in the meantime. Going forward I hope to completely migrate from my current lame usage of SortedList<K1, SortedList<K2, V>> to this library.

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The latest release is 4.0!

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