Extend @GetDocField to cache the received data

When I run a form with @GetDocField($Ref; fieldname) on multiple fields, it issues the same number of NRPC commands as the number of fields, and receives the entire document for each command.

There are two problems.

1. If the size of the referenced document is large, the large size data will be received many times.

2. Depending on the latency and bandwidth of the network, there is a noticeable impact on performance.

Let the Notes client keep the received document in the client's cache, and if there is no update in the reference, refer to the value in the cache and do not issue the NRPC command. If we can improve this way, we may be able to keep good performance of opening the referenced document.

I would like the option to cache the document received the first time the @GetDocField function is run. For example, specify the following.

@GetDocField($Ref; fieldname; [Cache])