Increase coverage for the Intl.DateTimeFormat constructor by adding a
test that confirms that ToObject(...) is appropriately called inside the
implementation.

Increase coverage for the Intl.DateTimeFormat constructor by adding a
test that checks for the default values.

Based on: https://github.com/tc39/test262/blob/44fc8165d54de9c9f0128f70eda56bdcb5dde82c/implementation-contributed/v8/intl/segmenter/segment-iterator-ownPropertyDescriptor.js

Fix wrong expectations of
Intl.RelativeTimeFormat.prototype.formatToParts
Add tests to cover "group", "decimal" and "fraction".

Fixes #1904

Ref: https://github.com/tc39/ecma402/issues/256.

This reverts commit c49c3567.

The order was defined in <https://github.com/tc39/ecma402/pull/279>.

This reverts commit a1c3929c.

This was changed in https://github.com/tc39/proposal-intl-list-format/pull/27.

* Changes Intl.ListFormat tests reflecting spec

Reflect https://github.com/tc39/proposal-intl-list-format/pull/27
while style:"narrow" and type is not "unit".

* add cases for throws

* remove commetns which cause lint error

This was added in https://github.com/tc39/proposal-intl-list-format/pull/25.

I don't know how to test that the option has any effect, so this just checks
that it is read and verified.

This was introduced in 6581e849.

Increase the coverage for the constructor for Intl.NumberFormat by
ensuring that HasProperty(O, Pk) is properly called.

Increase coverge for the Intl.NumberFormat constructor by testing that
Get(O, P) and ToString(arg) are properly called.