On an otherwise unloaded P4 1.g GHz

For certain very specific meanings of the word "unloaded", I'm sure. "foo" is optimized to 'foo' at compile time, so neither of them can possibly be faster. As you can see, the generated bytecode is equivalent:

2;0 juerd@ouranos:~$ perl -MO=Concise -e'$foo = "foo"'
6  <@> leave[t1] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v ->3
5     <2> sassign vKS/2 ->6
3        <$> const(PV "foo") s ->4
-        <1> ex-rv2sv sKRM*/1 ->5
4           <$> gvsv(*foo) s ->5
-e syntax OK
2;0 juerd@ouranos:~$ perl -MO=Concise -e'$foo = '\''bar'\'
6  <@> leave[t1] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v ->3
5     <2> sassign vKS/2 ->6
3        <$> const(PV "bar") s ->4
-        <1> ex-rv2sv sKRM*/1 ->5
4           <$> gvsv(*foo) s ->5
-e syntax OK
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Even "Hello, $name!" is optimized to 'Hello, ' . $name . '!'.

Note: I _do_ think people should use single quotes when not interpolating. It saves you a lot of hits on the backslash key, and avoids getting bitten by: "$You're kidding me" (eq. "$You::re kidding me"), "my@emailaddress.com" (intended: "my\@emailaddress.com").

- Yes, I reinvent wheels.
- Spam: Visit eurotraQ.

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