what's a "conversion error" and how do I correct it?

Working on a Linux box (Ubuntu 10.4), I've successfully copy/pasted a
block of text from a Planmaker spreadsheet into a vim file. The text
includes U+2012 dashes, which are correctly displayed in vim … but
when I try to save the vim file, I get the message "conversion error".

Probably related, but when I used :dig to try and find the code for
the U+2012 dash (so I could use search/replace) I couldn't spot one.
Just out of curiosity, what do the numbers in the digraph reference
page refer to?

Thanks in advance for helping me out.

--
You received this message from the "vim_use" maillist.
Do not top-post! Type your reply below the text you are replying to.
For more information, visit http://www.vim.org/maillist.php