[Pharo-users] Why should we not rely on #atEnd?

[Herbert Vojčík]

Citing from 
https://pharo.fogbugz.com/f/cases/21577/Cannot-read-from-dev-urandom,

  But we still shouldn't be relying on #atEnd so ... -- Alistair Grant
Why should we not rely on #atEnd? I had the impression that it is one of 
the most fundamental stream APIs, alongside next, nextPut: and reset.

Herby