Mixed type dropdown widget breaks

[philippjfr]

Just encountered this in an example where the widget values were both integers and strings, it seems in this case the dropdown widget will break and only selecting strings will work. Will add a minimal example shortly.

Here is a minimal example (thanks to @ahuang11)

df1 = pd.DataFrame(index=[1, 2, 3, 4])
df1['id'] = 'A'
df1['x'] = [1, 2, 3, 4]
df1['y'] = [1, 2, 3, 4]

df2 = df1.copy()
df2['id'] = 'B'
df2['y'] *= -1

df3 = df2.copy()
df3['id'] = 3
df3['x'] *= -1

df = pd.concat([df1, df2, df3])
df.holoplot('x', 'y', groupby='id', width=350).layout('id')
hv.Dataset(df).to.curve('x', 'y', 'id')

[philippjfr]

This works fine on master.