Tried this:

  :put=range(1,10)

and it worked as expected, appending the numbers 1..10 to my file.
Same with:

  :put=map(range(1,10), 'v:val')

which worked as expected.  However using a no-op lambda function:

  :put=map(range(1,10), {v -> v})

somehow gets the numbers 0..9 in the file instead of 1..10

This reduced it to the simplest case for demonstration.  I stumbled
across it attempting FizzBuzz in a one-liner:

:put=map(range(1, 100), {v -> v % 15 ? v % 5 ? v % 3 ? v : 'Fizz' :
'Buzz' : 'FizzBuzz'})

confused why it kept putting 0/FizzBuzz as the first row.

This is 8.2.1558 on FreeBSD in case it matters:

  :ver
  VIM - Vi IMproved 8.2 (2019 Dec 12, compiled Oct  4 2020 13:32:14)
  Included patches: 1-1558

I'm not sure where I'd start trying to troubleshoot this, but thought
I'd at least mention the oddity here.

-tim




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