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For example, suppose you wanted to validate a credit card.
All credit cards are 16 digits and the 16th digit can be calculated based on the first 15 numbers.
It helps you provide your users with feedback on their form submission before sending it to your server.
It saves you bandwidth, server load and it saves time for your users.
Since version 1.4.10, Σ Time Spent may be used to validate that work has already been logged once, before the current transition or within itself.