Now you will need to do
-f markdown+smart
instead of
-f markdown --smart
This change opens the way for writers, in addition to readers,
to be sensitive to +smart, but this change hasn't yet been made.
API change. Command-line option change.
Updated manual.
The type is implemented in terms of an underlying bitset
which should be more efficient.
API change: from Text.Pandoc.Extensions export Extensions,
emptyExtensions, extensionsFromList, enableExtension, disableExtension,
extensionEnabled.
