Why does std.string.munch take a string ref?

[w0rp via Digitalmars-d]

On Wednesday, 11 June 2014 at 20:27:41 UTC, Sean Kelly wrote:
> It's the only function in std.string that takes a string by ref 
> instead of by value, and this screws up call chaining.  What's 
> the reason for this?

munch modifies the string you give it.