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IanButterworth / ai_julia.md
Last active August 10, 2026 13:11
What AI thinks about julia

Summary

Three models (Claude Fable 5, Claude Opus 5, GPT-5.6-sol) were asked the same question cold — no reading or research — about their impression of Julia and what they'd most want fixed. Their assessments converge to a striking degree.

Without doing any reading, review, searches etc. tell me what your impression is of julia as a programming language, and what your top things you'd want to see fixed, or any friction you think should be lower

On the language itself, all three consider Julia's core design a success: multiple dispatch as the organizing principle, generic-code composability that no other ecosystem reproduces, a solved two-language problem, and a best-in-class packaging story (Pkg, environments, artifacts/JLLs).

On friction, the same themes appear in all three lists, differing mainly in ranking:

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IanButterworth / report.md
Created May 12, 2026 17:59
@IanButterworth
IanButterworth / heap_snapshot_worker.js
Created September 25, 2024 19:20
## unminified version of devtools/bundled/devtools-frontend/front_end/entrypoints/heap_snapshot_worker/heap_snapshot_worker.js
import * as e from "../../models/heap_snapshot_model/heap_snapshot_model.js";
import * as t from "../../core/i18n/i18n.js";
import * as s from "../../core/platform/platform.js";
import * as n from "../../models/text_utils/text_utils.js";
class i {
#e;
#t;
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IanButterworth / Pkg.precompile() with fftw error
Last active September 21, 2020 18:47
_
_ _ _(_)_ | Documentation: https://docs.julialang.org
(_) | (_) (_) |
_ _ _| |_ __ _ | Type "?" for help, "]?" for Pkg help.
| | | | | | |/ _` | |
| | |_| | | | (_| | | Version 1.6.0-DEV.995 (2020-09-21)
_/ |\__'_|_|_|\__'_| | ib/compilecache_hide_stderr/05c2ec109e (fork: 2 commits, 0 days)
|__/ |
julia> import Pkg
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IanButterworth / mactest
Created May 15, 2020 19:41
32×6 DataFrames.DataFrame
│ Row │ cat │ testname │ units │ ref_res │ test_res │ factor │
│ │ String │ String │ String │ Any │ Any │ Any │
├─────┼─────────────┼───────────────────────────┼────────┼──────────────────────────────────────────┼──────────────────────────────────────────┼───────────┤
│ 1 │ info │ SysBenchVer │ │ 0.3.0 │ 0.3.0 │ Equal │
│ 2 │ info │ JuliaVer │ │ 1.4.1 │ 1.4.1 │ Equal │
│ 3 │ info │ OS │ │ Linux (x86_64-pc-linux-gnu) │ macOS (x86_64-apple-darwin18.7.0) │ Not Equal │
│ 4 │ info │ CPU │
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IanButterworth / Flux JL_DEBUG_METHOD_INVALIDATION
Created May 3, 2020 05:35
julia> using Flux
-- max(Int32, Int32)
promote_type(Type{Float64}, Type{S} where S<:Integer)
promote_type(Type{Float64}, Type{S} where S<:Integer)
>> FixedPointNumbers.promote_rule(...) Tuple{typeof(Base.promote_rule), Type{T}, Type{Tf}} where Tf<:AbstractFloat where T<:(FixedPointNumbers.Normed{T, f} where f where T<:Unsigned)
promote_type(Type{UInt64}, Type{S} where S<:Unsigned)
_promote(UInt64, Unsigned)
promote(UInt64, Unsigned)
div(UInt64, Unsigned, Base.Rounding.RoundingMode{:ToZero})
rem(UInt64, Unsigned)
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IanButterworth / Revise invalidations during load
Created May 2, 2020 16:57
Last login: Sat May 2 12:51:45 on ttys006
ian@Ians-MacBook-Pro-4 julia % ./julia
_
_ _ _(_)_ | Documentation: https://docs.julialang.org
(_) | (_) (_) |
_ _ _| |_ __ _ | Type "?" for help, "]?" for Pkg help.
| | | | | | |/ _` | |
| | |_| | | | (_| | | Version 1.5.0-DEV.698 (2020-04-28)
_/ |\__'_|_|_|\__'_| | mcpu/72a1fec695* (fork: 4 commits, 4 days)
|__/ |
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IanButterworth / using Flux inference on aarch64
Created April 26, 2020 18:00
Ranked inference effort of `using Flux` via https://github.com/JuliaLang/julia/pull/34613
(Tuple{typeof(CuArrays._functional),Bool}, 4260)
(Tuple{typeof(lock),CuArrays.var"#1#2"{Bool},ReentrantLock}, 4259)
(Tuple{CuArrays.var"#1#2"{Bool}}, 4255)
(Tuple{typeof(CuArrays.__configure__),Bool}, 4082)
(Tuple{typeof(lock),CUDAnative.var"#1#2"{Bool},ReentrantLock}, 3783)
(Tuple{CUDAnative.var"#1#2"{Bool}}, 3783)
(Tuple{typeof(CUDAnative.__runtime_init__)}, 3783)
(Tuple{typeof(CUDAnative.release)}, 3783)
(Tuple{typeof(CUDAnative.version)}, 3783)
(Tuple{typeof(CUDAnative.functional),Bool}, 3783)
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IanButterworth / Flux profile 2 (faster depot location)
Created April 24, 2020 18:50
This file has been truncated, but you can view the full file.
Overhead ╎ [+additional indent] Count File:Line; Function
=========================================================
1╎1 @Base/array.jl:656; _array_for(::Type{Any}, ::Core.SimpleVector, ::Core.Compiler.HasLength)
2╎2 @Base/array.jl:657; _array_for(::Type{Any}, ::Array{Any,1}, ::Core.Compiler.HasShape{1})
1╎1 @Base/array.jl:567; _collect(::Type{Int64}, ::Core.Compiler.Generator{Core.Compiler.Iterators.Filter{Core.Compiler.var"#259#266"{Core.Compiler.IdDict{Int64,Int64}},Array{Int64,1}},Core.Compiler.var"#258#265"{Int64,Core.Compiler.IdDict{Int64,Int64},Array{Int64,1}}}, ::Core.Compiler.SizeUnknown)
2╎2 @Base/array.jl:352; copy(::Array{Int32,1})
1╎1 @Base/array.jl:2371; filter(::Core.Compiler.var"#268#271"{Array{Int64,1}}, ::Array{Int64,1})
2╎2 @Base/array.jl:764; iterate(::Array{Any,1})
╎1 @Base/compiler/abstractinterpretation.jl:101; abstract_call_gf_by_type(::Any, ::Array{Any,1}, ::Any, ::Core.Compiler.InferenceState, ::Int64)
╎ 1 @Base/compiler/abstractinterpretation
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IanButterworth / Flux profile aarch64
Last active April 24, 2020 17:51
This file has been truncated, but you can view the full file.
Overhead ╎ [+additional indent] Count File:Line; Function
=========================================================
1╎1 @Base/array.jl:657; _array_for(::Type{Any}, ::Array{Any,1}, ::Core.Compiler.HasShape{1})
1╎1 @Base/array.jl:313; copyto!(::Array{Tuple{Int64,Int64,Bool},1}, ::Int64, ::Array{Tuple{Int64,Int64,Bool},1}, ::Int64, ::Int64)
1╎1 @Base/array.jl:221; length(::Array{Any,1})
1╎1 @Base/array.jl:826; setindex!(::Array{Core.LineInfoNode,1}, ::Core.LineInfoNode, ::Int64)
1╎1 @Base/bitset.jl:196; _matched_map!(::Core.Compiler.var"#151#152", ::Array{UInt64,1}, ::Int64, ::Array{UInt64,1}, ::Int64, ::Bool, ::Bool)
2╎2 @Base/compiler/abstractinterpretation.jl:949; abstract_eval(::Any, ::Array{Any,1}, ::Core.Compiler.InferenceState)
1╎1 @Base/compiler/abstractinterpretation.jl:1283; typeinf_nocycle(::Core.Compiler.InferenceState)
1╎1 @Base/compiler/inferencestate.jl:116; Core.Compiler.InferenceState(::Core.Compiler.InferenceResult, ::Bool, ::Core.Compiler