This is the best argument I've seen for global constants. I get it.

sqb

The major difference I don't think anybody has mentioned is that since the
value of a constant is known at compile time, it can be inserted directly
into the resulting object code. So the value has only to be looked up once
- at compile time - whereas a variable always has to be re-evaluated at
runtime. A variable that's got from an accessor would seem to be even more
work because a handler has to be run to determine which variable to look up.

martin
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