Support uuid type

[hackwaly]

No description provided.

[jeromew]

Hello,
thanks for the report.

in order to support a new postgres type, there must be an agreement on which javascript structure will hold the data.
for floats, I chose the ieee754 module. For other types, native javascript types were ok.

For uuid, it could be a string like "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11" or an array of UInt8Array[16] or a buffer.
Each choice has pros/cons.

What is your use case ?

[jeromew]

In the PR #19 it is proposed that the uuid type should be represented in memory as a javascript string.

I would like to have more information on the use case for this because the type impedance (buffer // string) can have a real cost when it is applied on each and every uuid field of all the rows of a table.

I think the uuid are rarely modified so is the string representation really needed or is it just unnecessary work in a buffer=>string=>buffer scenario ?