(flex.info)Why doesn't yyrestart() set the start state back to INITIAL?

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Enter node , (file) or (file)node

Why doesn't yyrestart() set the start state back to INITIAL?
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There are two reasons.  The first is that there might be programs that
rely on the start state not changing across file changes.  The second
is that beginning with `flex' version 2.4, use of `yyrestart()' is no
longer required, so fixing the problem there doesn't solve the more
general problem.