What to change
Ask the supplier to choose input behaviour that supports the complete range of accepted answers, not just the most common example.
A worked example
Illustrative example
The email field makes the at-sign easy to reach, while the telephone field still permits the plus sign needed for an accepted international number.
How to check the result
Accept when keyboard choices reduce effort and every accepted format remains enterable and editable on the supported devices.
A mistake to avoid
Selecting a numeric field merely because most values contain digits can remove leading zeros or forbid meaningful non-numeric characters.
Your action checklist
Use these checks to prepare a discussion with your team or supplier. Tick a check when you have recorded the decision or evidence, rather than when a feature has simply been promised.
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Further reading
These primary sources provide additional context for the project decisions above.
Related decisions
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