ycb_sympy_pr13615

what a new run launched now would send

Complement doesn't work when input is a mixture of Symbols and numbers
```
>>> a=FiniteSet(x,y,2)
>>> b=Interval(-10,10)
>>> Complement(a,b)
{x, y}
```
`{x, y} \ [-10,10]` is expected as output.

Work only inside this repository checkout. Make the code change the task
describes, keeping the diff focused — no drive-by refactors.

When you are done, leave your changes committed or in the working tree;
they are collected automatically.

Stay on this snapshot checkout (`task/ycb_sympy_pr13615`). Never checkout, pull, or rebase onto `main`. That branch is a README-only orphan.
Stay on this HEAD. Do not fetch another default branch. Push only on the Cursor-created `crazy-cursor/…` side branch from this HEAD.

Some past runs of this task were launched with a different prompt (the prompt template changed since, or those runs predate this benchmark's stored prompt). Each run persists the exact prompt it sent at launch — that per-launch record is the audit trail; this page shows only the current one.