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Why base type is citext and not text?

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Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,10 @@`
`1`		`-CREATE EXTENSION citext;`
	`1`	`+CREATE EXTENSION IF NOT EXISTS citext;`
`2`	`2`
	`3`	`+/*`
	`4`	`+Why base type is citext and not text?`
	`5`	`+Because email is case insensetive, for example: alex.f@ya.ru = Alex.F@ya.ru.`
	`6`	+So we can create unique constraint `alter table my_table add unique (email)`. Not `alter table my_table add unique (lower(email))`.
	`7`	`+*/`
`3`	`8`	`CREATE DOMAIN email AS citext CHECK(`
`4`	`9`	`octet_length(VALUE) BETWEEN 6 AND 320 -- https://en.wikipedia.org/wiki/Email_address`
`5`	`10`	`AND VALUE LIKE '_%@_%.__%' -- rough, but quick check email syntax`

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