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Document that chkpass ignores password characters after the eighth.

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Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-$PostgreSQL: pgsql/contrib/chkpass/README.chkpass,v 1.2 2003/11/29 19:51:19 pgsql Exp $`
	`1`	`+$PostgreSQL: pgsql/contrib/chkpass/README.chkpass,v 1.3 2005/09/23 15:05:04 tgl Exp $`
`2`	`2`
`3`	`3`	`Chkpass is a password type that is automatically checked and converted upon`
`4`	`4`	`entry. It is stored encrypted. To compare, simply compare agains a clear`
`@@ -17,6 +17,10 @@ passwords without re-encrypting them. If you want the password (encrypted)`
`17`	`17`	`without the colon then use the raw() function. This allows you to use the`
`18`	`18`	`type with things like Apache's Auth_PostgreSQL module.`
`19`	`19`
	`20`	`+The encryption uses the standard Unix function crypt(), and so it suffers`
	`21`	`+from all the usual limitations of that function; notably that only the`
	`22`	`+first eight characters of a password are considered.`
	`23`	`+`
`20`	`24`	`D'Arcy J.M. Cain`
`21`	`25`	`darcy@druid.net`
`22`	`26`

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