title: Not able to compare two dataframes
body: <p>I have two Dataframes, df1 and df2 with same structure.
  I want to find common rows between them using <code>df1.merge(df2)</code> but there is one row I am facing issue with:</p>
  <pre><code>&gt;&gt;&gt; df2
    reference_period analyzed_domain account is_misc total_estimated_visits  total_estimated_monthly_unique_visitors  total_estimated_visit_duration  total_estimated_pageviews  estimated_deduplicated_audience
  0       2017-11-01          abc     xyz       0                   1000                                    278.0                          5788.0                    80159.0                              0.0
  &gt;&gt;&gt; df1=df1.head(1)
  &gt;&gt;&gt; df1
    reference_period analyzed_domain account is_misc total_estimated_visits  total_estimated_monthly_unique_visitors  total_estimated_visit_duration  total_estimated_pageviews  estimated_deduplicated_audience
  0       2017-11-01          abc     xyz       0                   1000                                    278.0                          5788.0                    80159.0                              0.0
  &gt;&gt;&gt; df1==df2
     reference_period  analyzed_domain  account  is_misc  total_estimated_visits  total_estimated_monthly_unique_visitors  total_estimated_visit_duration  total_estimated_pageviews  estimated_deduplicated_audience
  0              True             True     True    False                    True                                     True                            True                       True                             True
  &gt;&gt;&gt; df1.dtypes
  reference_period                           datetime64[ns]
  analyzed_domain                                    object
  account                                            object
  is_misc                                            object
  total_estimated_visits                             object
  total_estimated_monthly_unique_visitors           float64
  total_estimated_visit_duration                    float64
  total_estimated_pageviews                         float64
  estimated_deduplicated_audience                   float64
  dtype: object
  &gt;&gt;&gt; df2.dtypes
  reference_period                           datetime64[ns]
  analyzed_domain                                    object
  account                                            object
  is_misc                                            object
  total_estimated_visits                             object
  total_estimated_monthly_unique_visitors           float64
  total_estimated_visit_duration                    float64
  total_estimated_pageviews                         float64
  estimated_deduplicated_audience                   float64
  dtype: object
  
  </code></pre>
  <p>I am not sure why python is not able to equate is_misc column.
  Could someone please help?
  Thanks</p>