Implement collection capability predicates: associative?, counted?, indexed?, reversible?, sorted?, seqable?, ifn?, map-entry?, distinct?, not-every?

[andreasronge]

Context

Part of the Clojure core candidate implementation effort (Phase 4). Collection capability predicates and logic predicates.

Functions to implement

Function	Description
associative?	Returns true if coll implements Associative
counted?	Returns true if constant-time count
indexed?	Returns true if supports indexed access
reversible?	Returns true if collection reversible
sorted?	Returns true if collection sorted
seqable?	Returns true if implements Seqable
ifn?	Returns true if invokable
map-entry?	Returns true if map entry
distinct?	Returns true if all args distinct
not-every?	Returns true if pred false for some

Notes

• Most are simple type/capability checks
• distinct? and not-every? are logic predicates, not collection predicates, but similar effort
• Some predicates may need adaptation for BEAM types vs JVM types

🤖 Generated with Claude Code

[andreasronge]

Implemented in 425664b. Added all 10 predicates: associative?, counted?, indexed?, reversible?, sorted?, seqable?, ifn?, map-entry?, distinct?, not-every?