Segments cannot contain maximum value.

[RobertDurfee]

Unfortunately, given how segments are represented as closed-open intervals, the maximum value cannot be included in the segment. I have not yet determined a simple, consistent way to address this. For now, this is not a main concern for me as the current implementation fits my needs well enough.

Workarounds:

• For any of the numeric types, the maximum value should just not be considered a valid value. For example, valid Unicode is from U+0000 to U+10FFFF. Therefore, when representing Unicode using u32, it is safe to ignore 0xFFFFFFFF.
• For an enumerated type (support for convenience constructors--like closed and all--coming soon with It doesn't make sense to have enumerated types implement num::One, num::Zero, or std::ops::Add. #1), simply append an Unused (or similar) variant to the list of variants. Then, the default #[derive(Ord, PartialOrd)] will have that as the maximum value.