It would be very useful if all "as.*" functions were generic,
so that a user who creates a new class can write methods to
coerce objects of that class to standard R objects.
In fact, most of the "as.*" functions are generic, but there
are a few that aren't:
as.array
as.factor
as.ordered
as.pairlist
as.formula
as.ts
It's actually "as.array" and "as.ts" that are a problem for
me, but I mention the others because this seems like a good
general principle.
Martyn
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