Case statement variation 1.9.2 vs 1.8.7

Ruby
1

I have this case statement:

case n.hll_normalize
when “common name”
@my_correspondent.correspondent_common_name = s
when “legal name”
. . .
else
raise ArgumentError, “#{n} attribute is not provided for.”
end

I pass it this value for n: “common name”

When run with Ruby-1.8.7p302 this works. The exact same code run with
Ruby-1.9.2p0 yields:

common name attribute is not provided for. (ArgumentError)

Is this change in behaviour intentional or a bug? If intentional then
what is the version insensitive way to accomplish the same thing?

2

This is the method that we add to String used in the case statement:

def hll_normalise
strip.squeeze(" ").mb_chars.downcase
end

3

Sorry, this is evidently a RoR issue. I will move it to there.