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prevent unicode-confusion in password by applying PRECIS, and username/email address by applying unicode NFC normalization
an é (e with accent) can also be written as e+\u0301. the first form is NFC, the second NFD. when logging in, we transform usernames (email addresses) to NFC. so both forms will be accepted. if a client is using NFD, they can log in too. for passwords, we apply the PRECIS "opaquestring", which (despite the name) transforms the value too: unicode spaces are replaced with ascii spaces. the string is also normalized to NFC. PRECIS may reject confusing passwords when you set a password.
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@ -10,7 +10,7 @@ func TestLsub(t *testing.T) {
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tc := start(t)
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defer tc.close()
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tc.client.Login("mjl@mox.example", "testtest")
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tc.client.Login("mjl@mox.example", password0)
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tc.transactf("bad", "lsub") // Missing params.
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tc.transactf("bad", `lsub ""`) // Missing param.
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