adobeDataLayer.push fails when some older versions of RequireJS already exist on page

[charltoncraig]

Expected Behaviour

adobeDataLayer.push({'abc':1}) should append {'abc':1} to the adobeDataLayer queue

Actual Behaviour

Uncaught TypeError: isPlainObject is not a function
at getType (adobe-client-data-layer.js:547)
    at module.exports (adobe-client-data-layer.js:540)
    at adobe-client-data-layer.js:225
    ...

Reproduce Scenario (including but not limited to)

Steps to Reproduce

Navigate to about:blank
Paste into the console and execute:

var scriptElement = document.createElement('script');
scriptElement.src = "https://requirejs.org/docs/release/2.1.9/minified/require.js"
document.body.append(scriptElement);

Paste into the console and execute (above code block must execute first):

window.adobeDataLayer =  [];
var scriptElement = document.createElement('script');
scriptElement.src = "https://unpkg.com/@adobe/adobe-client-data-layer@1.1.0/dist/adobe-client-data-layer.js";
document.body.append(scriptElement);

Paste into the console and execute:
adobeDataLayer.push({'abc':1})

Platform and Version

Chrome Version 85.0.4183.102

Sample Code that illustrates the problem

Logs taken while reproducing problem