Extra endgroup inexplicably in XeLaTeX interchartoks

Question

This minimal code is throwing me an extra endgroup error in XeLaTeX and I can't for the life of me understand why! Does anyone have a solution to this error?
documentclass{article}
usepackage{xcolor}
XeTeXinterchartokenstate = 1
newXeTeXintercharclass mydigitsclass

XeTeXcharclass `Q mydigitsclass

XeTeXinterchartoks 0 mydigitsclass = {begingroupcolor{green}}
XeTeXinterchartoks mydigitsclass 0  = {endgroup}
XeTeXinterchartoks 255 mydigitsclass = {begingroupcolor{green}}
XeTeXinterchartoks mydigitsclass 255  = {endgroup}

begin{document}

Qa a Q

end{document}

egreg · Accepted Answer

The boundary has been raised from 255 to 4095 with the TeX Live release of 2019,
XeTeX 3.14159265-2.6-0.999991
If I apply the change to your code I get

David Carlisle · Answer

The boundary class hass been 4095 not 255 for some years:

documentclass{article}
usepackage{xcolor}
XeTeXinterchartokenstate = 1
newXeTeXintercharclass mydigitsclass

XeTeXcharclass `Q mydigitsclass

XeTeXinterchartoks 0 mydigitsclass = {1begingroupcolor{green}}
XeTeXinterchartoks mydigitsclass 0  = {2endgroup}
XeTeXinterchartoks 4095 mydigitsclass = {3begingroupcolor{green}}
XeTeXinterchartoks mydigitsclass 4095  = {4endgroup}

begin{document}

Qa a Q

end{document}

The digits just to make it easier to see where the tokens are added.

Extra endgroup inexplicably in XeLaTeX interchartoks

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