DEC: support functions with more then 62 arguments #1727
Merged
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All (non-shared) arguments to DEC'ed functions are combined into tuples,
so they can all be defined via a single case expression.
But because GHC's tuples are limited to 62 elements, this fails for functions with many arguments.
This patch uses GHC's mkChunkified to create (2-levels of) nested tuples for a maximum of 62^2=3844 arguments.
Fixes #1669