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Use factors correctly. Fixes #151

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1 parent 7c7a228 commit 17fdc2528c1e3f228fe09c2514f64b89313a796b @hadley hadley committed with Apr 12, 2012
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3 NEWS
@@ -1,3 +1,6 @@
+* built in datasets have been checked to make sure they use characters,
+ factors and ordered factors appropriately
+
* `geom_raster` and `annotation_raster` gain new `interpolate` argument for
controlling whether or not rasters are interpolated
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