Remove gocheck

[elmacnifico]

as discussed i removed gocheck and added a new assert.

I also fixed the benchmarks but i am pretty sure they don't work. I'll fix that next. There was one weird thing with the "no error on close" logic, so if you could have a quick look i got that right.

[elmacnifico]

i made the discussed changes. let me know if i should squash the commits.

[elmacnifico]

fixed 😉

[oschwald]

Thanks! I merged this from the command line.