Error when using postValues from api

[kingpatrickj]

I'm trying to create a button that will update a field when pressed. My ultimate goal is to integrate this with the Dice Roller plugin to update values based on a dice roll. For now I'm just trying to get the metadata-menu api to work by itself. I have the following basic test code:

const {postValues} = app.plugins.plugins["metadata-menu"].api;
const {fileFields} = app.plugins.plugins["metadata-menu"].api;
const fields = await fileFields('file/path.md');

const testButton = dv.el('button', "Test") 
testButton.focus() 

testButton.addEventListener('click', async (event) => { 
	 let oldValue = dv.current().test;
	 let newValue = oldValue + 1;
	 let Payload = [{name: 'test', payload: { value: newValue }}];
	 await postValues('file/path.md', Payload);
	}
)

The button renders, but the field does not update when I click it. I also get an error in the console:

plugin:metadata-menu:339 

Uncaught (in promise) TypeError: _rawValue.startsWith is not a function
    at parseFieldValue (plugin:metadata-menu:339:21)
    at renderField (plugin:metadata-menu:370:20)
    at pushNewField (plugin:metadata-menu:410:24)
    at eval (plugin:metadata-menu:456:13)
    at Array.forEach (<anonymous>)
    at eval (plugin:metadata-menu:432:22)
    at Generator.next (<anonymous>)
    at fulfilled (plugin:metadata-menu:47:24)
pparseFieldValue	@	plugin:metadata-menu:339
renderField	@	plugin:metadata-menu:370
pushNewField	@	plugin:metadata-menu:410
eval	@	plugin:metadata-menu:456
eval	@	plugin:metadata-menu:432
fulfilled	@	plugin:metadata-menu:47
Promise.then (async)		
step	@	plugin:metadata-menu:59
eval	@	plugin:metadata-menu:60
__async	@	plugin:metadata-menu:44
postFieldsInYaml	@	plugin:metadata-menu:402
eval	@	plugin:metadata-menu:580
eval	@	plugin:metadata-menu:12891
eval	@	plugin:metadata-menu:60
__async	@	plugin:metadata-menu:44
executeNext	@	plugin:metadata-menu:12886
eval	@	plugin:metadata-menu:12882
eval	@	plugin:metadata-menu:60
__async	@	plugin:metadata-menu:44
pushTask	@	plugin:metadata-menu:12878
eval	@	plugin:metadata-menu:579
eval	@	plugin:metadata-menu:60
__async	@	plugin:metadata-menu:44
postValues	@	plugin:metadata-menu:545
eval	@	plugin:metadata-menu:13264
eval	@	plugin:metadata-menu:60
__async	@	plugin:metadata-menu:44
eval	@	plugin:metadata-menu:13263
eval	@	VM2591:13

If I take out the postValues() line, the error doesn't occur. If I output newValue using dv.paragraph(newValue) it prints the correct value. So, it's pulling the old value and calculating the new one appropriately. I'm not sure if this is an issue with my code or an issue with the api, but any help would be greatly appreciated!

[kingpatrickj]

After doing some more testing, I found that postValues() only accepts strings as values. I got numbers to work with newValue.toString() with the number still able to increment like normal after running the script. Similarly for dates (though I haven't found a way to manipulate a date, then convert it to a string). Links work if you wrap the text with '[[]]'. I haven't tested any other field types, but they would presumably work like the rest.