Changelog

Notable changes to Data Attributes are documented here, newest release first. The format follows Keep a Changelog.

[Unreleased]

[3.0.0] - 2026-10-07

Minecraft 1.21.1 rewrite for Fabric and NeoForge.

Added

• NeoForge support alongside Fabric for Minecraft 1.21.1.
• Server-authoritative Fzzy Config JSON5 configuration for both loaders.
• Live application of accepted in-game configuration changes. Loaded living entities adopt supplier-owned base changes on their next tick.
• An informational Datapack Baseline Preview for attribute overrides, functions, and entity base values, synchronized from the server and never saved back to configuration or datapacks.
• Configuration suggestions for registered entity types and Data Attributes' implicit entity groups.
• Persistent supplier-base tracking so configured base values can update without overwriting deliberate runtime changes, including /attribute ... base set.
• Reattachment to supplier ownership when a live base is set back to its current configured value.
• Bounded GZIP synchronization of runtime configuration snapshots.
• Kotlin serialization compiler support for datapack and runtime snapshot serialization.

Changed

• Attribute Definition Overrides now control bounds, stacking behavior, diminishing smoothness, and display formatting separately from entity base values.
• Entity Base Attributes are the configuration and datapack layer responsible for assigning entity supplier base values.
• Entity configuration resolves from vanilla defaults through matching implicit groups to explicit entity entries. Server configuration overrides the datapack baseline.
• Entity base values remain raw; attribute bounds constrain the calculated result rather than rewriting stored configuration values.
• Entity entries apply as deltas, avoiding unnecessary supplier rebuilds and preserving inherited values not explicitly overridden.
• Configuration fields are organized into Bounds, Stacking, and Display groups. Explicit Override Minimum/Maximum switches replace user-facing NaN inheritance values.
• Attribute Function descriptions clarify that the outer key is the parent/source attribute and the nested key is the child/derived attribute.
• Identifiers belonging to absent optional mods can remain configured.
• Datapack reloads rebuild configuration once at reload completion and respect normal resource-pack priority.
• Native Fabric/NeoForge custom-payload networking replaces the OWO network channel, and a loader-neutral event implementation replaces OWO event streams.
• Loader-specific Fzzy Config integrations use 0.7.7+1.21 on Fabric and 0.7.7+1.21+neoforge on NeoForge, with shared runtime code consuming loader-neutral snapshots.
• Disabled server override entries suppress matching datapack overrides.
• Project metadata and documentation now reference the Bare Minimum Studios repository and the Bare Minimum License (BML) v1.0.

Removed

• OWO Lib/OOLib, OWO Sentinel, and Endec dependencies and their associated repository declarations.
• The old /reload command-tail hook.
• Vanilla sword/tool hooks that incorrectly treated durability damage as attack damage.
• Duplicate mob equipment-comparison injections.
• Unused OWO interface code and legacy helpers.

Fixed

• Configuration map additions failing with Identifier invalid or not allowed, using valid defaults, identifier validation, and live registry suggestions.
• NeoForge compilation failures caused by Fabric-mapped Fzzy Config classes entering shared source.
• Runtime modifiers being lost during live configuration rebuilds.
• Explicit entity entries resetting unrelated inherited values to vanilla defaults.
• Attribute dirty/update/synchronization behavior affecting health, absorption, and other stateful attributes after live rebuilds.
• Resource-stack rebuilding mutating maps during iteration.
• Self-referencing functions and non-finite function coefficients or entity base values are safely ignored.
• Implicit entity-group entries being discarded during registered-ID filtering.
• Standalone and supplier attribute modifier additions, modifier-removal bookkeeping, and dependent-function invalidation after base or transient changes.
• Incorrect Holder-versus-Attribute casts in diminishing stacking and formatted-value lookup.
• Implicit entity-category definitions crashing when no vanilla supplier exists.
• Stale attribute override state remaining after an override is removed.