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|A motivation for dicts as primary citizens|
library(record), which generates access predicates for a term using positional arguments from a description.
library(assoc)which represents the associations as a balanced binary tree.
This situation is unfortunate. Each of these have their advantages
and disadvantages. E.g., compound terms are compact and fast, but
inflexible and using positional arguments quickly breaks down. Library
library(record) fixes this, but the syntax is considered
hard to use. Lists are flexible, but expensive and the alternative
key-value representations that are used complicate the matter even more.
library(assoc) allows for efficient manipulation of
changing associations, but the syntactical representation of an assoc is
complex, which makes them unsuitable for e.g., options lists as
seen in predicates such as open/4.