Generate ARRAY[..] for PostgreSQL

[lf-]

I would like to generate a value ARRAY[1, 2] in an esqueleto query.

There is mkTextArray in the internals of JSON.hs, but otherwise not really anything that I can find.

cc @parsonsmatt

[lf-]

hm, val [a, b, c], but that's for literals only (i think?). I would like to use it for columns