* @summary Get the number of calendar ISO weeks between the given dates.
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*
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* @description
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* Get the number of calendar ISO weeks between the given dates.
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*
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* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
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*
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* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
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*
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* @param dateLeft - The later date
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* @param dateRight - The earlier date
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*
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* @returns The number of calendar ISO weeks
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*
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* @example
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* // How many calendar ISO weeks are between 6 July 2014 and 21 July 2014?