Ignore leading zeros
Add a comment to explain the last commit
The index limit is inclusive
Standardize some of the comments
Redefined the import reduction algorithm

The algorithm now processes the digits in the number string in an
unrolled loop. All whole chunks of 19 digits are processed in this
manner. Any leftover digits are processed in a simple loop that
accumulates a group of digits less than 19.
convert should be pure nothrow @safe
processAccumulator is not pure as it modified the data store
The public API should have notes relevant to the end user
Improved the explanation of how the data is encoded in the store