An immutable interval of Chars with inclusive ends.
Each interval contains all characters x with min <= x <= max.
x
min <= x <= max
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The inclusive maximum of the interval.
This value has to be greater or equal to min.
The inclusive minimum of the interval.
This value has to be less or equal to max.
An immutable interval of Chars with inclusive ends.
Each interval contains all characters
xwithmin <= x <= max.