[tz] zdump man page misleading?

[Paul Eggert]

On 2/25/21 1:06 AM, Martin Burnicki via tz wrote:
> 
> So the lower year is *inclusive* and the upper year is *exclusive*, and 
> from my understanding these words should be swapped in the text of the 
> man page. Or am I missing something?

Yes, but the real problem here is that zdump's behavior is confusing so 
the documentation is confusing.

On reflection it's probably better to change zdump -c and -t so that 
lower bounds are consistently inclusive and upper bounds consistently 
exclusive. Although this is an incompatible change, I doubt whether 
anybody will notice or care. Proposed patch attached, and installed in 
the development repository on GitHub.

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