Array.indexedMap's index is 1023 maximum

[evancz]

(Originally reported by @tyomalu in elm/elm-lang.org#262)

Here is the issue:

import Array
import Array (Array)
import Text (asText)

testArray: Array number
testArray = Array.initialize 3000 identity

mapArray: Array a -> Array a
mapArray array =
    Array.indexedMap (\i el -> 
        -- here max i == 1023
        case (Array.get i array) of
            Just x -> x
            otherwise -> el
    ) array


main =
    testArray |>
    mapArray |>
    asText

mapArray should just return array itself with values 0..2999, but it returns 0..1023, 0..1023, 0..951.
I've found that index in function passed to indexedMap reaches 1023 maximum.
I suggest the problem is in Array.js indexedMap_ function:

    function indexedMap_(f, a, from) {
      var newA = { ctor:"_Array", height:a.height, table:new Array(a.table) };
      if (a.height > 0) { newA.lengths = a.lengths; }
      for (var i = 0; i < a.table.length; i++) {
        newA.table[i] = a.height == 0 ? A2(f, from + i, a.table[i])
                                      : indexedMap_( f, a.table[i]
                                                   , i == 0 ? 0 : a.lengths[i - 1]); // should be i == 0 ? from : from + a.lengths[i-1]);?
      }
      return newA;
    }

[jvoigtlaender]

Closing this, since it appears it's fixed by https://github.com/elm-lang/core/pull/391. (Right, @eeue56?)

[jvoigtlaender]

Closing this, since it appears it's fixed by https://github.com/elm-lang/core/pull/391. (Right, @eeue56?)

[eeue56]

Yup, fixes it so can be closed

[eeue56]

Yup, fixes it so can be closed