statistikat / VIM / 88

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travis-ci

fix tests

since data.table uses reference semantics rather
than lazy data structures, it is necessary to
use the force() to make sure the parameters
dist_var and variable are evaluated before the
object data is manipulated in the function body
of kNN.

If the return value does not have the correct
type (R/kNNFaster#185), then indexing does
not behave as expected in one of the tests
(tests/test_kNN.R#65)

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