assay
error-handling

value-plus-name

Subject
op:+
Category
value
Formula
=("a"+1)+NOTAFUNCTION()
Canonical
#VALUE!

Per-engine results

matches canonical diverges no fixture

Engine Verdict Value
gsheets match #VALUE!
excel match #VALUE!
lattice match #VALUE!
ironcalc match #VALUE!
hyperformula match #VALUE!
libreoffice diverge
formulas match #VALUE!
pycel diverge #NAME?