ExpandingMan

This isn't a bug. The Feather format supports missing values but columns still must have a type specified for non-missing values, even if all happen to be missing. The simplest...

I definitely don't want to choose some arbitrary type as default just to circumvent the error. We don't want to have Feather files sitting around where the data types come...

Ok, I've had a chance to look at this a bit. I think there's a bigger problem that this issue is a symptom of. Right now what happens is the...

Please note that currently the automated documentation updates seem to be broken, we need to provide travis with a proper key. I cleaned up the `gh-pages` branch a little, there...

I'm not too surprised that the files created in Julia are bigger. As I recall, we've seen examples of some of the other writers automatically deciding to write dictionary encoded...

Yeah, as an aside, I've also been having some rather strange compatibility issues (at least I think that's what it was). Write now when I do `Pkg.add` it points to...

You are correct, the dataframe did have `String`s.

The issue doesn't appear to be strings. Here is the result of serializing and deserializing a `DataFrame` of 3 columns of 2*10^6 `Float64` ``` INFO: Serializing... 3.252102 seconds (2.69 M...

Here is a [gist](https://gist.github.com/ExpandingMan/7c6e484e36c96a1869fd2b9309c75ef1) showing what I used for testing.

Pretty sure we are quite close to Python now, if not faster, in best case scenario (i.e. no strings). Haven't done a detailed set of benchmarks yet. If anyone wants...