templater: drop bool support from evalastype()
Future patches will split evalastype() into two functions, evalrawexp()
and unwrapastype(), so we can catch the exception of type conversion.
# evaluating function may bubble up inner ParseError
thing = evalrawexp(context, mapping, arg)
try:
return unwrapastype(context, thing)
except ParseError:
# add hint and reraise
However, evalboolean() can't be factored out in this way since it has to
process boolean-like symbols as non keyword. Fortunately, it's unlikely
that we'll need a general type converter supporting bool, so this patch
drops it from the table.
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