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spec: document the underlying type of comparable
For #50791. Change-Id: I7f135bb6626128a3cee9fd71c57535c1fc83ac7f Reviewed-on: https://go-review.googlesource.com/c/go/+/380854 Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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@ -820,7 +820,8 @@ An alias denotes a named type if the type given in the alias declaration is a na
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<p>
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Each type <code>T</code> has an <i>underlying type</i>: If <code>T</code>
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is one of the predeclared boolean, numeric, or string types, or a type literal,
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is one of the predeclared boolean, numeric, or string types, the predeclared
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type <code>comparable</code>, or a type literal,
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the corresponding underlying type is <code>T</code> itself.
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Otherwise, <code>T</code>'s underlying type is the underlying type of the
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type to which <code>T</code> refers in its <a href="#Type_declarations">type
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