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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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vendor/golang.org/x/text/internal/language/common.go
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vendor/golang.org/x/text/internal/language/common.go
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// Code generated by running "go generate" in golang.org/x/text. DO NOT EDIT.
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package language
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// This file contains code common to the maketables.go and the package code.
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// AliasType is the type of an alias in AliasMap.
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type AliasType int8
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const (
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Deprecated AliasType = iota
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Macro
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Legacy
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AliasTypeUnknown AliasType = -1
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)
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