function onChange(control, oldValue, newValue, isLoading, isTemplate) {
	if (isLoading) {
		return;
	}
	
	var scriptHasUncommentedLines, flyoutText;
	
	var isAdvanced = (newValue === 'true');
	var origScriptVal = (g_form.getValue('script').trim());
	var doesScriptExist = (!!origScriptVal);
	var newScriptVal = '';
	
	if (isAdvanced) {
		//If the ACL is advanced, but is empty, then we don't need to do anything.
		if (!doesScriptExist) {
			return;
		}
		//If the ACL is advanced, make sure it doesn't contain any commented-out code.
		//If it does, un-comment it.
		newScriptVal = toggleACLScriptComments(origScriptVal, false);
	} else {
		//If the ACL is not advanced, make sure it doesn't contain any executable code.
		//If it does, comment it out.
		scriptHasUncommentedLines = (getUncommentedLines(origScriptVal).length > 0);
		
		//If the script doesn't exist or is already commented out, don't do anything.
		if (!doesScriptExist || !scriptHasUncommentedLines) {
			return;
		}
		
		newScriptVal = toggleACLScriptComments(origScriptVal, true);
	}
	
	if (newScriptVal === origScriptVal) {
		//If the script has not changed, don't do anything.
		return;
	}
	
	flyoutText = '<p>As per <a href="https://support.servicenow.com/kb?id=kb_article_view' +
		'&sysparm_article=KB0728012" target="_blank">KB0728012</a>, Business Rules and ACLs ' +
		'with the "Advanced" checkbox set to <strong>false</strong> <i>will still execute any ' +
		'code in the "Script" field</i>. <br />' +
		'This can cause performance issues and unexpected behavior that can be very ' +
		'difficult to troubleshoot, so it\'s recommended to remove any code in the "Script" ' +
		'field if the "Advanced" checkbox is set to <strong>false</strong>.</p>';
	if (isAdvanced) {
		flyoutText += '<p>In this case, since the "Advanced" checkbox has been set to ' +
			'<strong>true</strong>, and the script has previously been commented out by this ' +
			'functionality, the script has been un-commented.</p>';
	} else {
		flyoutText += '<p>In this case, since the "Advanced" checkbox has been set to ' +
			'<strong>false</strong> and the script field contained come code that was not ' +
			'commented out, the script has been commented out to avoid this potentially ' +
			'unexpected behavior.</p>';
	}
	flyoutText += '<p>Original script value:</p>\n' +
		'<div style="width:75%;overflow:auto">\n' +
		'<pre>' + origScriptVal + '</pre>\n' +
		'</div>';
	
	g_form.setValue('script', newScriptVal);
	g_form.clearMessages();
	showExpandingFormMessage(
		('The ACL\'s script has been ' + (isAdvanced ? 're-enabled' : 'commented out') +
			' since the "Advanced" checkbox has been set to ' + newValue + '.<br />'),
		flyoutText,
		'More info',
		'Hide info'
	);
	
	//Helper functions
	
	/**
	 * Accepts some code and a boolean indicating whether the code should be commented or
	 * uncommented. Returns the code with the appropriate comments added or removed. If the code has
	 * already been commented out using this function, it will not change the code.
	 * @param {string} codeInput - The code to comment or uncomment
	 * @param {boolean} [shouldBeCommented=true] - A boolean indicating whether to comment out the
	 *  code in the codeInput argument (true) or uncomment it (false).
	 * Defaults to true.
	 * @returns {string}
	 */
	function toggleACLScriptComments(codeInput, shouldBeCommented) {
		var i, currentLine, linesOfCode;
		var commentExplanation = '/*\n' +
			'\tThis code has been disabled because this ACL\'s "Advanced" field has been set to \n' +
			'\tfalse. To enable this code, set the "Advanced" field to true. If you\'re seeing \n' +
			'\tthis code as disabled and the advanced field is already set to true (which \n' +
			'\tshould be the only way to see this code), something has gone wrong. Please \n' +
			'\trefresh this form and then disable and re-enable the Advanced checkbox or \n' +
			'\tmanually un-comment this code.\n' +
			'*/\n\n';
		var commentPrefix = '//~Disabled~// ';
		var output = [];
		
		//Set default value of shouldBeCommented
		shouldBeCommented = (typeof shouldBeCommented === 'undefined' ? true : !!shouldBeCommented);
		
		if (shouldBeCommented && codeInput.startsWith(commentExplanation)) {
			//If the code should be commented, but is already commented out, return it as-is.
			return codeInput;
		}
		
		if (shouldBeCommented) {
			output.push(commentExplanation);
		} else {
			//If the code should be uncommented, remove the comment explanation if it exists.
			codeInput = codeInput.replaceAll(commentExplanation, '').trim();
		}
		
		linesOfCode = codeInput.split('\n');
		
		for (i = 0; i < linesOfCode.length; i++) {
			currentLine = linesOfCode[i];
			
			if (shouldBeCommented) {
				output.push(commentPrefix + currentLine);
			} else {
				output.push(currentLine.replaceAll(commentPrefix, ''));
			}
		}
		
		return output.join('\n');
	}
	
	//Let's use ES6 for this cause it's easier, and why not.
	function getUncommentedLines(codeToCheck) {
		var uncommentedLines = [];
		var isMultilineComment = false;
		const lines = codeToCheck.split('\n');
		
		lines.forEach(line => {
			if (isMultilineComment) {
				if (line.includes('*/')) {
					isMultilineComment = false;
					const remaining = line.split('*/')[1];
					if (remaining.trim() !== '') {
						uncommentedLines.push(remaining);
					}
				}
			} else {
				if (!line.trim() || line.trim().startsWith('//')) {
					return;
				}
				
				if (line.trim().startsWith('/*')) {
					isMultilineComment = true;
					const remaining = line.split('/*')[0];
					if (remaining.trim() !== '') {
						uncommentedLines.push(remaining);
					}
					return;
				}
				
				uncommentedLines.push(line);
			}
		});
		
		return uncommentedLines;
	}
	
	/**
	 * Display an expandable form message. This message will be shown at the top of whatever form
	 *  this code is executed on. The text in firstLine will be shown, but the text in flyoutText
	 *  will be hidden until the user clicks the 'expand' link.
	 *
	 * @param {String} firstLine - The first line of text in the message, which will be shown
	 *  immediately when this code executes. Unlike the text in flyoutText, this text will not
	 *  be hidden.
	 * @param {String|HTML_TEXT} flyoutText - This text will be hidden by default, but will be shown
	 *  once the user clicks the 'expand' link (which you can customize by setting expandLinkText).
	 * @param {String} [expandLinkText="Show more"] - Optionally specify the text to be shown as
	 *  a clickable link, which will cause the form message to expand and display the text
	 *  specified in flyoutText.
	 * @param {String} [collapseLinkText="Hide details"] - Optionally specify the text to be shown
	 *  after the user clicks the 'expand' link text (specified in expandLinkText).
	 * This text will be shown when the message is expanded and the text specified in flyoutText
	 *  is shown. Upon clicking this text, the message will be collapsed, flyoutText will be hidden,
	 *  and the link text will revert back to that specified in expandLinkText.
	 *
	 * @example
	 * showExpandingFormMessage(
	 *  'This message expands',
	 *  flyoutListHTML,
	 *  'Show more',
	 *  'Hide details'
	 * );
	 */
	function showExpandingFormMessage(firstLine, flyoutText, expandLinkText, collapseLinkText) {
		var formMsg = firstLine;
		
		expandLinkText = (typeof expandLinkText !== 'string') ? 'Show more' : expandLinkText;
		collapseLinkText = (typeof collapseLinkText !== 'string') ? 'Hide details' : collapseLinkText;
		
		formMsg += '<div>';
		formMsg += '<p><a href="#" onclick="javascript:jQuery(this.parentNode).next().toggle(200); ' +
			'this.innerText = ((this.innerText === \'' + expandLinkText + '\')?\'' + collapseLinkText +
			'\':\'' + expandLinkText + '\');">' + expandLinkText + '</a></p>';
		formMsg += '<div style="display: none;">';
		formMsg += flyoutText;
		formMsg += '</div>';
		formMsg += '</div>';
		
		g_form.addInfoMessage(formMsg);
	}
}