  The momentum dependence of the superconducting gap in the cuprates has been
debated, with most experiments reporting a deviation from a simple
$d_{x^2-y^2}$ form in the underdoped regime and a few experiments claiming that
a simple $d_{x^2-y^2}$ form persists down to the lowest dopings. We affirm that
the superconducting gap function in sufficiently underdoped
Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ (Bi-2212) deviates from a simple
\textit{d}-wave form near the antinode. This is observed in samples where
doping is controlled only by oxygen annealing, in contrast to claims that this
effect is only seen in cation-substituted samples. Moreover, a quasiparticle
peak is present at the antinode down to p$=$0.08, refuting claims that a
deviation from a simple \textit{d}-wave form is a data analysis artifact
stemming from difficulty in assessing a gap in the absence of a quasiparticle.
