Commit 4b1e28b

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Clarify description of Seek::stream_len

It can only describe the inner workings of the default implementation, other implementations might not be implemented using seeks at all.

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Original file line number	Diff line number	Diff line change
`@@ -2028,7 +2028,7 @@ pub trait Seek {`
`2028`	`2028`
`2029`	`2029`	`/// Returns the length of this stream (in bytes).`
`2030`	`2030`	`///`
`2031`		`- /// This method is implemented using up to three seek operations. If this`
	`2031`	`+ /// The default implementation uses up to three seek operations. If this`
`2032`	`2032`	`/// method returns successfully, the seek position is unchanged (i.e. the`
`2033`	`2033`	`/// position before calling this method is the same as afterwards).`
`2034`	`2034`	`/// However, if this method returns an error, the seek position is`

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