raoulb/sympy — comment on commit 87e1dfb2aeccce867a3e8677d2a990e4a450f14a
File: sympy/functions/special/error_functions.py line 148
By raoulb:

Why does limit fail when I add this function? It's returns not a wrong answer
but some python error deep within the cache system:

```
86 k = k + tuple(map(lambda x: type(x), k))
87 try:
---> 88 return func_cache_it_cache[k]
89 except KeyError:
90 pass

TypeError: unhashable type: 'list'
```