[Tagging] Irrigation: usage=irrigation vs irrigation=yes [Was Irrigation: ditches, canals and drains]

[Mateusz Konieczny]

4 Jun 2019, 02:16 by graemefitz1 at gmail.com:

> waterway=canal / drain / ditch
> navigation=yes/no
> irrigation=yes/no
> drainage=yes/no
>
Maybe also drainage=only/irrigation=only would make sense.

If it is unwanted then explicit documentation of that solely boolean
yes/no is acceptable would be nice.
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