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Running `source ~/.zshrc` can have side effects, it's better to reload the whole 
zsh session with `exec zsh`.

Currently, encode64 plugin using `echo -n` to print the content
of $1 variable. This approach will not work with arbitrary data,
which contains sequence of escaped characters, since when many
`echo` implementation will expand them.

This commit chage the usage to `printf`, which is builtin in all
POSIX shells and can print arbitrary data reliability.