From: Xiangyu  Yang <xiangyu.yang@...>
Date: 2004-07-15T14:52:18+09:00
Subject: when will coerce be called?

I want to treat "true" as 1 and "false" as 0. So I do:
class TrueClass
def coerce(other)
[other,1]
end
end

class FalseClass
def coerce(other)
[other,0]
end
end

But the code works only for +, -; not for &, |.
irb(main):485:0> 1+true
=> 2
irb(main):486:0> 1|true
TypeError: cannot convert true into Integer
from (irb):486:in `|'
from (irb):486
        from :0

Why?