lxml.objectify and leading zeros

When the objectify element is printed on the console, the leading zero is lost, but it is preserved in the .text:

>>> from lxml import objectify
>>> 
>>> xml = "<a><b>01</b></a>"
>>> a = objectify.fromstring(xml)
>>> print(a.b)
1
>>> print(a.b.text)
01

From what I understand, objectify automatically makes the b element an IntElement class instance. But, it also does that even if I try to explicitly set the type with an XSD schema:

from io import StringIO
from lxml import etree, objectify

f = StringIO('''
   <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
     <xsd:element name="a" type="AType"/>
     <xsd:complexType name="AType">
       <xsd:sequence>
         <xsd:element name="b" type="xsd:string" />
       </xsd:sequence>
     </xsd:complexType>
   </xsd:schema>
 ''')
schema = etree.XMLSchema(file=f)
parser = objectify.makeparser(schema=schema)

xml = "<a><b>01</b></a>"
a = objectify.fromstring(xml, parser)
print(a.b)
print(type(a.b))
print(a.b.text)

Prints:

1
<class 'lxml.objectify.IntElement'>
01

How can I force objectify to recognize this b element as a string element?