Hi Peter,
no reason as far as hledger and hledger-lib is concerned, but one of
the add-on packages, which depends on them, also requires process
1.0.1.4. If you install hledger or hledger-lib with the older version
of process, then cabal is not able to install the add-on package.
Sorry for the inconvenience, there are probably more such cases and
I'm not sure how to handle it better.
-Simon
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