Error on StringValueBinder `convertFormula` check about phpspreadsheet

[oleibman]

StringValueBinder is working as expected. See https://phpspreadsheet.readthedocs.io/en/latest/topics/accessing-cells/#using-value-binders-to-facilitate-data-entry. In particular, "By default, the StringValueBinder will cast any datatype passed to it into a string. However, there are a number of settings which allow you to specify that certain datatypes shouldn't be cast to strings, but left "as is":". If you want formulas to not be converted to strings, you must specify

$stringValueBinder->setFormulaConversion(false)

[oleibman]

Closing. Person reporting the issue indicated agreement with this assessment in the linked PR.