max stack frame exceeded when foldl with object/array as accumulated value

The following code would fail (i know this is not meaningful, but just act as a reduced example)
```
std.foldl(function(p, c) [p[0]+1, c], std.range(0, 2000), [0, 0])
```
Output:
```
Error: RUNTIME ERROR: max stack frames exceeded.
```

I thought this was due to lack of tail recursion optimization, but that's not the case if the accumulated value is a string.
Hence the following code is fine by writing a new foldl wrapper (workaround, so accumulated value is a string instead)

```
local foldl(f, arr, init) =
std.parseJson(std.foldl(function(p, curr)
std.manifestJson(f(std.parseJson(p), curr))
, arr, std.manifestJson(init)));

foldl(function(p, c) [p[0]+1, c], std.range(0, 2000), [0, 0])
```
Output:
```
[
2001,
2000
]
```

I found this problem as I was trying to using jsonnet to solve advent of code (https://gist.github.com/bigdrum/1980304abc6561d01f12dad50aa73538). But I would not be surprised if this happens in real world usage.