Lightning-datatable has wrong type of parameters passed to custom type columns through typeAttributes that passsed not with "fieldName"

[Paul-Kalynyn]

Description

I have created custom type for editing Picklist values of records using lightning-combobox. Inside its template it uses typeAttributes.options for options attribute. But if you specify in column configuration "typeAttributes" : { "options" : [ option1, options2 ]} then it will pass to actual options of lightning-combobox not the specified array, but an object { "0" : option1, "1": option2 }. And then under the hood lightning-combobox will ignore it and use empty array for options. But if you specify column configuration with "typeAttributes" : { "options" : { "fieldName" : "actionFieldName" } and then modify all rows of data for datatable by adding field "actionFieldName" that will contains expected options [ option1, option2 ] as value - it will work as expected, but this kind of configuration can be called workaround.

Steps to Reproduce

1. Create LWC that extend LightningDatatable.
2. Create custom type with edit template for lightning-datatable.
3. Use lightning-combobox inside this template with {typeAttributes.options} as value for options attribute:

<template>
	<lightning-combobox
		name="customCombobox"
		data-inputable="true"
		label={typeAttributes.label}
		value={editedValue}
		placeholder={typeAttributes.placeholder}
		options={typeAttributes.options}
		variant="label-hidden"
		dropdown-alignment="auto">
	</lightning-combobox>
</template>

4. For static customTypes variable of created LWC use this:

customCombobox : {
	template: customComboboxTemplate,
	editTemplate: customComboboxEditTemplate,
	typeAttributes: [ 'label', 'placeholder', 'options', 'value' ],
	standardCellLayout: true
}

5. Create LWC that will use this LWC as datatable and add column with created custom type:

 {
	label: 'Custom Picklist',
	fieldName: 'picklistData',
	type: 'customCombobox',
	typeAttributes: {
		label: 'Custom Picklist',
		placeholder: 'Choose Value...',
		options: [ {
			{ label: 'Option 1', value: 'option1' },
			{ label: 'Option 2', value: 'option2' }
		}],
		value: { fieldName : 'picklistData' }
	},
	hideDefaultActions: true,
	editable : true
}

Expected Results

When you pass data to this custom lwc and clicks on edit button near "Custom Picklist" column value, then combobox appears with ability to choose between "Option 1" and "Option 2".

Actual Results

Combobox appears with no options to select

Version

SF Api version 60.0