Invalid value for PaymentRequest update()

[DarrenLumber]

Whilst attempting to update using window.payButton.refresh(); the JS console reports the following error:

1 Uncaught (in promise) IntegrationError: Invalid value for PaymentRequest update(): displayItems.1.amount should be an amount in the currency's subunit. You specified: 994.9999999999999.

I think the problem "item" is the shipping price which should be $9.95 and feels somewhat similar to issue #4

WebPayment 1.0.3
Craft Commerce 2.2.7
Craft CMS 3.3.15
PHP 7.3.1