使用bin_plot观察分箱时，不支持column为bool型

[xujingyi0707]

设计评分卡时对分类型特征进行了onehot编码处理，保存为bool型。能够成功训练，分箱结果为A [[False], [True]]。
但是使用bin_plot画图时，提示不支持bool型：
from toad.plot import bin_plot
col = 'A'
bin_plot(c.transform(train_selected[[col,'label']], labels=True), x=col, target='label')

报错：

TypeError Traceback (most recent call last)
Cell In[22], line 3
1 from toad.plot import bin_plot
2 col = 'A'
----> 3 bin_plot(c.transform(train_selected[[col,'label']], labels=True), x=col, target='label')

File ~/miniconda3/envs/toad/lib/python3.8/site-packages/sklearn/utils/_set_output.py:140, in _wrap_method_output..wrapped(self, X, *args, **kwargs)
138 @wraps(f)
139 def wrapped(self, X, *args, **kwargs):
--> 140 data_to_wrap = f(self, X, *args, **kwargs)
141 if isinstance(data_to_wrap, tuple):
142 # only wrap the first output for cross decomposition
143 return (
144 _wrap_data_with_container(method, data_to_wrap[0], X, self),
145 *data_to_wrap[1:],
146 )

File ~/miniconda3/envs/toad/lib/python3.8/site-packages/toad/transform.py:93, in Transformer.transform(self, X, *args, **kwargs)
91 except Exception as e:
92 e.args += ('on column "{key}"'.format(key = key),)
---> 93 raise e
95 return res

File ~/miniconda3/envs/toad/lib/python3.8/site-packages/toad/transform.py:90, in Transformer.transform(self, X, *args, **kwargs)
88 if key in self.rules:
89 try:
---> 90 res[key] = self.transform_(self.rules[key], X[key], *args, **kwargs)
91 except Exception as e:
92 e.args += ('on column "{key}"'.format(key = key),)

File ~/miniconda3/envs/toad/lib/python3.8/site-packages/toad/transform.py:264, in Combiner.transform_(self, rule, X, labels, ellipsis, **kwargs)
261 bins = bin_by_splits(X, rule)
263 if labels:
--> 264 formated = self.format_bins(rule, index = True, ellipsis = ellipsis)
265 empty_mask = (bins == self.EMPTY_BIN)
266 bins = formated[bins]

File ~/miniconda3/envs/toad/lib/python3.8/site-packages/toad/utils/mixin.py:186, in BinsMixin.format_bins(self, bins, index, ellipsis)
184 l.append(keys)
185 else:
--> 186 label = ','.join(keys)
187 if ellipsis is not None:
188 label = label[:ellipsis] + '..' if len(label) > ellipsis else label

TypeError: ('sequence item 0: expected str instance, bool found', 'on column "A"')