Use prefix increment operator where easily done.
Make `baseSortedIndex` handle `NaN` correctly when comparing numbers.
Add `toObject` and optimize use of `toIterable` in `_.sample`.
Add/cleanup tests for using methods as a callback for `_.map` and `_.reduce`.
Add test for `_.slice` where `start` >= `end`.
Simplify `support.nonEnumArgs` and increase code coverage.
Add bizarro tests for `_.parseInt`.
Ensure `_.sortedIndex` and `_.sortedLastIndex` align with `_.sortBy`.
Rebuild dist.