Failed to load the css-edit-groups package

[Enter steps to reproduce:]

1. ...
2. ...

Atom: 1.33.1 x64
Electron: 2.0.16
OS: Microsoft Windows 10 Home
Thrown From: css-edit-groups package 0.4.2

Stack Trace

Failed to load the css-edit-groups package

At Duplicate key 'cmd-l'

Error: Duplicate key 'cmd-l'
    at Object.r (<embedded>:11:582004)
    at addProperty (<embedded>:14:1904262)
    at Array.reduce (<anonymous>:null:null)
    at Obj (<embedded>:14:1903928)
    at transformNode (<embedded>:14:1905302)
    at Value (<embedded>:14:1903176)
    at transformNode (<embedded>:14:1905302)
    at addProperty (<embedded>:14:1904250)
    at Array.reduce (<anonymous>:null:null)
    at Obj (<embedded>:14:1903928)
    at transformNode (<embedded>:14:1905302)
    at Value (<embedded>:14:1903176)
    at transformNode (<embedded>:14:1905302)
    at Block (<embedded>:14:1903134)
    at transformNode (<embedded>:14:1905302)
    at Object.parse (<embedded>:14:1905323)
    at m (<embedded>:11:579247)
    at c (<embedded>:11:579453)
    at Object.readFileSync (<embedded>:11:580546)
    at keymaps.getKeymapPaths.map.e (<embedded>:11:3033867)
    at Array.map (<anonymous>:null:null)
    at Package.loadKeymaps (<embedded>:11:3033855)
    at measure (<embedded>:11:3027409)
    at Package.measure (<embedded>:11:3026604)
    at Package.load (<embedded>:11:3027345)
    at PackageManager.loadAvailablePackage (<embedded>:11:381299)
    at PackageManager.loadPackage (<embedded>:11:380027)
    at PackageManager.activatePackage (<embedded>:11:382531)
    at <embedded>:11:917626
    at r (<embedded>:11:912232)
    at o (<embedded>:14:1037419)
    at ChildProcess.n.process.on.e (<embedded>:14:1037625)
    at emitTwo (events.js:126:13)
    at ChildProcess.emit (events.js:214:7)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:198:12)

Commands

     -4:56.8.0 pane:move-active-item-to-top-of-stack (input.hidden-input)
     -4:54.6.0 snippets:previous-tab-stop (input.hidden-input)
     -4:54.6.0 editor:outdent-selected-rows (input.hidden-input)
     -3:12.3.0 editor:newline (input.hidden-input)
     -3:09.5.0 snippets:next-tab-stop (input.hidden-input)
     -3:09.5.0 snippets:expand (input.hidden-input)
     -3:09.5.0 editor:indent (input.hidden-input)
  6x -3:08.1.0 core:backspace (input.hidden-input)
     -2:55.4.0 grammar-selector:show (atom-text-editor.editor.is-focused)
     -2:31.3.0 snippets:next-tab-stop (input.hidden-input)
     -2:31.3.0 snippets:expand (input.hidden-input)
     -2:31.3.0 editor:indent (input.hidden-input)
     -2:31 snippets:next-tab-stop (input.hidden-input)
     -2:31 snippets:expand (input.hidden-input)
     -2:31 editor:indent (input.hidden-input)
 22x -2:30.6.0 core:backspace (input.hidden-input)

Non-Core Packages

atom-burnt-orange-syntax 1.0.0 
atom-burnt-orange-ui 1.0.0 
css-edit-groups 0.4.2 
framer-syntax 1.1.0 
framer-ui 2.0.0 
teletype 0.13.3 

Start by reproducing the package-load failure in Atom 1.33.1 on Windows 10 and inspect the package's keymap files, following the Package.loadKeymaps entry point in the stack trace. The issue is done when the duplicate 'cmd-l' key is resolved and css-edit-groups loads without the reported error.