Fix bugs uncovered by AFL #41
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This fixes an issue discovered by AFL.rs, where we eagerly unwrap the result of `isize::from_str_radix` because we checked that the string contains only valid digits. However, we did not check that the string of digits form a number within the range of `isize`, and potentially try to parse a number larger than `isize::MAX`. This resulted in an `Err` return value, and a panic when we unwrap it.
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Fixes #39