Add Blob support

[dmitrizagidulin]

What would be the level of effort to add Blob support (basically, support for xhr.responseType = 'blob' and xhr.send(Blob), as described in the xhr2 tutorial)?

It seems like Blob support has finally made it into all the browsers except for Opera Mini.

[pwnall]

TL;DR: it'd be lots of work that I'm not prepared to commit.

Blob is complicated because of the constructor and the FileReader API that comes with it.

I expect that implementing the whole W3C File API would get the library to more than 2x the current size, and that doesn't even account for possible interop problems with other libraries implementing their own Blob polyfill.

[rajsite]

Node now supports Blob, think it makes sense to support it if it exists on global?