[Click] read and write handlers

[Andy Van Maele]

Hello,

using click for some time now, I am familiar with the concept of read,
write and read-write handlers.
After updating my click version (after some time), I've noticed more
variations when having a look at the handlers.
E.g. using a ToDevice element, and having a look at the
/click/ToDevice/handlers file, there seem to be different kinds of read
handlers:
- r
- r.
- rD

After searching through the documentation, I can't find the difference
between these indications. Could someone point them out, or give me a
hint where I can continue my search ?

regards,
Andy Van Maele
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