max_digits10 guarantees float decimal roundtrip (#4435)
max_digits10 guarantees float decimal roundtrip (#4435)

2 additional digits are not needed to guarantee that casting the decimal representation will result in the same float, see https://github.com/dmlc/xgboost/issues/3980#issuecomment-458702440
dmlc/xgboost,dmlc/xgboost,dmlc/xgboost,dmlc/xgboost,dmlc/xgboost,dmlc/xgboost