Module keys 

Injective composite-key encoding.

encode_composite_key joins text fields into one string such that distinct field tuples can never collide. It is the building block for a stable identity key over an equality index, where a naive separator-join (a:b:c) is unsound: the fields themselves may contain the separator, so ["a", "b:c"] and ["a:b", "c"] would collide.

Functions

encode_composite_key

Encodes fields into one string that is injective in the field tuple: distinct inputs always produce distinct outputs and equal inputs produce equal outputs, whatever the fields contain.