`concat-blank-coerces-to-empty-string`

Subject: op:&
Category: value
Formula: =A1:A3&"!"
Canonical: {x!; !; z!}

Per-engine results

matches canonical diverges no fixture

Engine	Verdict	Value
gsheets	match	{x!; !; z!}
excel	match	{x!; !; z!}
lattice	match	{x!; !; z!}
ironcalc	diverge	#N/IMPL!
hyperformula	match	{x!; !; z!}
libreoffice	diverge	—
formulas	match	{x!; !; z!}
pycel	diverge	#NAME?