Unexpected @ in a formula producing =_xlfn.SINGLE()
Excel will only remove @ from a formula where previous Excel versions would have used Implicit Intersection to return a single value from a Range or Named Range or function parameter.
You will be warned by Excel if you try to enter a formula with @ in an unexpected place, but it is still possible to create such a formula. An unexpected @ will create a _xlfn.SINGLE() in previous versions and will result in #Name when calculated.
For example =@A1 will be converted to =_xlfn.SINGLE(A1) because Excel cannot do Implicit Intersection on a single cell.
CheckDA will flag such formulas as type @
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