Wrong column dtypes int32 

I'm using danfojs@1.1.2 in the browser, loaded from the official CDN link taken from the documentation.
Tested in Chrome and Firefox

df = new dfd.DataFrame([ { "A" : "10"}, { "A" : "100"}])
df.dtypes >>> [  "int32" ]
df["A"].sum() >>> "010100"

if i do:

df2 = df.asType("A", "int32")
df2.dtypes >>> [  "int32" ]
df2["A"].sum() >>> 110

