Introduction

These documents explain the rationale, contracts, and tradeoffs behind HFF's language design. The language specification defines the query language; records provide context for individual design choices.

Record	Status	Date	Author
001: Compact Predicates	Accepted	2026-10-11	@ornew
002: Guards and Presence	Accepted	2026-10-11	@ornew
003: Collection Predicates	Accepted	2026-10-11	@ornew
004: Go API and Backend Construction	Accepted	2026-10-11	@ornew
005: Explicit Type Guards	Accepted	2026-10-11	@ornew
006: Method Calls Without Empty Parentheses	Accepted	2026-10-11	@ornew
007. Structural Equality Capabilities	Accepted	2026-10-11	@ornew
008. Versioned Time-Zone Profiles	Accepted	2026-10-11	@ornew
009. Extension Method Contracts	Implemented	2026-10-11	@ornew
010. SQL Extension Translation	Accepted	2026-10-11	@ornew
011. Compatibility Profiles	Accepted	2026-10-12	@ornew
012. PostgreSQL JSONB Type Metadata	Accepted	2026-10-12	@ornew
013. PostgreSQL Flattened Structure Presence	Accepted	2026-10-12	@ornew
014. PostgreSQL Relation Bindings	Accepted	2026-10-12	@ornew
015. Exact PostgreSQL Float Arithmetic	Superseded	2026-10-13	@ornew
016. Canonical PostgreSQL JSON Serialization	Accepted	2026-10-13	@ornew
017. PostgreSQL JSON Parsing	Accepted	2026-10-13	@ornew
018. PostgreSQL Timestamp Storage	Accepted	2026-10-13	@ornew
019. PostgreSQL JSON Union Dispatch	Accepted	2026-10-13	@ornew
020. PostgreSQL JSON Timestamp Values	Accepted	2026-10-13	@ornew
021. Backend-Native Approximate Float Semantics	Accepted	2026-10-14	@ornew
022. Versioned configuration documents	Accepted	2026-10-14	@ornew

Use the record template when adding a design record.