The author(s) of "array.dtx" seem to have picked this one up :
% \changes{v1.9e}{1988/05/11}{Re-introduced `@xargarraycr and
% `@yargarraycr, since `endtemplate seems to
% be `outer.}
Philip Taylor
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John Hobby wrote:
> The "weird feature" is that the end of an alignment template is
> considered "outer".