In #next-update, Cynthia listed functions missing from the menu state on dev: Angle, CreateMaterial, GetLoadPanel, HTTP, http, LerpAngle, LerpVector, OrderVectors, UpdateLoadPanel and Vector. Rubat confirmed it and said the change wasn't silent: the changelog states "Remove some unused libs from menu state". He added that the wiki shouldn't list menu state functions at all, since the menu state isn't meant for modding. On GitHub, kila58's issue "CreateMaterial missing from menu state" was closed as not planned.

In #lua-help, full metal sergeant 228 asked whether there's a better way to do controllable textures, since he heard the default matproxy library is very slow, and noted LVS creates a material per entity. Artemking4 suggested instancing a material per usage from a base material and changing only what's needed. Asked by TankNut how slow matproxy must be for that to be the alternative, he said creating materials is "dirt cheap" because they are just containers for shader inputs.

In #lua-help, 0d9b reported that util.JSONToTable turns strings that look like vectors into vectors even when called with ignoreConversions set to true. He asked whether this is intended, calling a JSON parser that mangles the output without an option to keep the original values "a bit useless for... parsing json". Artemking4 said he prefers MessagePack.

In #developer-talk, TankNut described problems with his physics-driven mech: movement is unpredicted, so multiplayer feels slow, and hook order breaks things because the mech moves in PhysicsUpdate after its turrets update in PlayerPostThink/Think. He added that the biggest problem in recreating player movement is that Lua has no equivalent of entity->PhysicsImpact, though ApplyForceOffset might be enough. He later said it may matter less, since it seems to be only for touch-related things.

Commit bb557c on main ports a fix for math.ceil/math.floor, adds self checks for corrupted map files and stops the load command from booting you out of the session when the save is missing.

Commit 9ecf4a on main makes prediction errors on arrays include the index for ints and floats, fixes a couple of multicore rendering memory leaks and a crash in render.UpdateScreenEffectTexture.

RaphaelIT7 asked for a Lua binding of CBasePlayer::FindUseEntity. robotboy655 closed it with a link to Player:GetUseEntity.

robotboy655 applied a fix on dev for the 2017 issue about bad UV tiling in surface.DrawTexturedRectUV, noting it may move to a separate function or argument if it breaks addons (commit 6a75b6).

Commit 6a75b6 on main makes surface.DrawTexturedRectUV ignore the "sub pixel adjustment" of UVs so its UV arguments work as expected; only the Lua binding is affected.

callumok2004 reported that returning a value in PostDrawSkyBox prevents the 3D skybox flag from being reset. Fixed on 12 October (commit 693484).

marchc1 asked for more functions like Entity:CopyBoneMatrix for hot paths. Grocel linked the :Left() request; artemking4 argued for an optional dst argument on all getters instead.

Commit c18cba on main makes Entity:SetPos run trigger touch events, fixes several controller input bugs and fixes the old value passed to SetNWVarProxy callbacks.

Commit 71ca28 on main adds 9 new Combine-related props from the licensee repo and fixes engine.CloseServer claiming the server is shutting down when it is not.

wrefgtzweve reported that engine.CloseServer() prints the shutdown message even when -allowquit is not set. robotboy655 made it not print when nothing happens and documented the return value on the wiki (commit 71ca28).

Commit 7be067 on main blocks the envmap and lightprobe commands from Lua, fixes some dupes, saves and demos not loading, and adds more decompression self checks.

Commit efb205 on main enables ALT+F4 to close the game, makes Entity:Get/SetNetworkAngles exist serverside, applies the requested getmetatable() LuaJIT fix and brings several map compiler limits and fixes over from TF2.

DatGuy64 proposed keeping the existing 32 submaterial slots and adding an overflow allocated on first use for indices of 32 and above. The code is reconstructed from a disassembly of the x86-64 build.

Cynosphere asked for serverside Entity:Get/SetNetworkAngles. Closed as completed the same day; commit efb205 makes them exist serverside and validate values.

Commit 185851 on main makes surface.DrawPoly throw an error when given fewer than 3 vertices, fixes ropes turning invisible in a specific multicore setup and restores sk_auto_reload_time.

robotboy655: "Made it throw an error when giving it less than 3 verts" (commit 185851).