cleaner handling of bin defaults

Author: alexcjohnson

src/traces/histogram/bin_defaults.js

@@ -23,8 +23,9 @@ module.exports = function handleBinDefaults(traceIn, traceOut, coerce, binDirect
         coerce(binDirection + 'bins.start');
         coerce(binDirection + 'bins.end');
         coerce(binDirection + 'bins.size');
-        coerce('autobin' + binDirection);
-        coerce('nbins' + binDirection);
+
+        var autobin = coerce('autobin' + binDirection);
+        if(autobin !== false) coerce('nbins' + binDirection);
     });
 
     return traceOut;

src/traces/histogram/clean_bins.js

@@ -65,7 +65,7 @@ module.exports = function cleanBins(trace, ax, binDirection) {
     var autoBinAttr = 'autobin' + binDirection;
 
     if(typeof trace[autoBinAttr] !== 'boolean') {
-        trace[autoBinAttr] = !(
+        trace[autoBinAttr] = trace._input[autoBinAttr] = !(
             (bins.start || bins.start === 0) &&
             (bins.end || bins.end === 0)
         );