**Formatting broken?**

Finally off my phone and looking at an example in two browsers it seems the formating was lost somewhere. I think the formatting on one of your examples above should be:

```
numbers = frozenmap((i, i ** 2) for i in range(1_000_000))
with numbers.mutating() as copy:
for i in numbers:
if not (numbers[i] % 997):
del copy[i]
numbers_without_997_multiples = frozenmap(copy)
# at this point, *numbers* still has 1_000_000 key/values, and
# *numbers_without_997_multiples* is a copy of *numbers* without
# values that are multiples of 997.
for i in numbers:
if not (numbers[i] % 593):
del copy[i]
numbers_without_593_multiples = frozenmap(copy)
print(copy[10]) # will print 100.
print(copy[10]) # This will throw a ValueError as copy
# has been closed when the âwithâ block
# was executed.
```