Change "if" -> "if and only if" to make more clear

[mooncak]

Change "if" -> "if and only if" to make it more clear

[mooncak]

/assign @chrislovecnm

[justinsb]

Ah - this is "iff" in the sense of "if and only if" https://en.wikipedia.org/wiki/If_and_only_if#Origin_of_iff_and_pronunciation

I agree that's pretty obscure though, so if you wanted to do if -> if and only if that would be clearer :-)

[mooncak]

Ah - this is "iff" in the sense of "if and only if" https://en.wikipedia.org/wiki/If_and_only_if#Origin_of_iff_and_pronunciation

I agree that's pretty obscure though, so if you wanted to do if -> if and only if that would be clearer :-)

Done

[mikesplain]

Thanks @mooncak!
/ok-to-test
/lgtm
/approve

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