Memory limit of input validators

[Tagl]

Perhaps this rather belongs on the spec.

We need to make sure that input validators can be run with high memory limits. Whether that means having a high default limit or making it configurable.
Being limited to 1GB is not enough, as often you may want to do some level of brute force in the input validator to ensure everything is definitely correct. This may require much more memory than running a solution to the problem. The current limit seems to default to 1GB, which is quite low for pypy, which uses more memory usually than cpython. I encounter memoryerrors in pypy relatively often due to this.

[gkreitz]

I think it belongs here, rather than in the spec. Thanks for raising the issue, the input validators I've looked at have generally been quite simplistic, and have not required a lot of RAM.

Making it configurable is of course nice, but if we can find a good default that Just Works (tm), that's even better. What would be a default that would work for your input validators? I think raising the default to 2 or 4 GB would be fine.