urlencode generates wrong result for some characters

[Aeron Monroe]

urlencode seems to generate encoded values with leading blanks instead of zeros.
For example:

$ echo -e "\\n\\n" | xargs -0 urlencode
% A% A% A

This should be
%0A%0A%0A

---

$ lsb_release -rd
Description: Ubuntu Zesty Zapus (development branch)
Release: 17.04

$ apt-cache policy gridsite-clients
gridsite-clients:
  Installed: 2.3.2-3
  Candidate: 2.3.2-3
  Version table:
 *** 2.3.2-3 500
        500 http://ports.ubuntu.com/ubuntu-ports zesty/universe powerpc Packages
        100 /var/lib/dpkg/status