Remove fails if the value for the key is undefined.

[DaveEmmerson]

A { a: undefined }
B {}
patch = diff(A,B) (results in 'remove a')
patchInPlace(patch, A)

fails with "path does not exist"

// key must exist for remove
if(notFound(pointer) || pointer.target[pointer.key] === void 0) {
	throw new InvalidPatchOperationError('path does not exist ' + change.path);
}

The cause is the check for pointer.target[pointer.key] not being undefined.
The key needs to be present, but if the value is undefined that shouldn't prevent a removal.

[hollandjake]

Issue still exists.

While technically undefined is not a supported type in JSON, it is supported in JavaScript, possibly we could enable a flag in the options to allow this behaviour.

Current code has the issue triggering at

jiff/lib/patches.js

Lines 180 to 182 in 035d5ac

	if(change.value === void 0) {
	throw new InvalidPatchOperationError('missing value');
	}

This would also need to be reflected in the type hints as currently we only allow null