`f668a6`

Subject: ISNUMBER
Category: value
Formula: =ISNUMBER({1,"a",TRUE,3})
Canonical: {true, false, false, true}

Per-engine results

matches canonical diverges no fixture

Engine	Verdict	Value
gsheets	match	{true, false, false, true}
excel	match	{true, false, false, true}
lattice	match	{true, false, false, true}
ironcalc	diverge	false
hyperformula	match	{true, false, false, true}
libreoffice	diverge	true
formulas	match	{true, false, false, true}
pycel	diverge	true