resources type fails to purge package when packages exist whose $name != $title

Puppet Version: 5.5.17
Puppet Server Version: n/a (fails also on puppet apply)
OS Name/Version: RHEL 7.6

Experimenting to remove unmanaged packages, I have experimented with the following stanza:

resources {'package':

  purge => true,

} 

Because it is not uncommon for various modules to define package resources with differing titles and names, such as:

package {'http-server':

  name => 'apache24',

  ensure => 'installed',

} 

Desired Behavior:
I expect the code to display a list of packages for deletion when run with the --noop flag.

Actual Behavior:
The catalog fails to compile with following error when I use my example manifest:

Error: Failed to apply catalog: Cannot alias Package[sl] to [nil, "sl", :yum]; resource ["Package", nil, "sl", :yum] already declared (file: /root/example.pp, line: 2)

Examples:

# example.pp

# This causes errors because $title != $name

package {'waste-of-time':

  name => 'sl',

  ensure => 'installed',

}

resources {'package':

  purge => true,

}

Run puppet apply --noop example.pp to see this error yourself. PLEASE BE CAREFUL AND ENSURE NOOP.