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It's only legal for each `now` to be consumed by at-most one `at` form, so at that point you'd just be re-implementing the "timeline" and "instant" system from mariposa. The need to wrap the program in a form and the management of `now` "values" has me pondering the implications of IanTheHenry's macaroni[1] system, which (like the CSS :has operator) allow macros to climb up into manipulations of their parent forms-- the `now` macro could effectively wrap every remaining for in the program in a new context the augments eg. the closure of `at`. But indeed, perhaps a problem to not become too invested in :p
1: https://github.com/ianthehenry/macaroni
You don't necessarily need to embed it into the programming language itself to get a ton of value. XTDB (https://github.com/xtdb/xtdb) offer a Clojure, Java and HTTP API for interacting with the database, which is bitemporal and lets you query the database for a specific point in time for example.