Add simple @public macro, set compat to Julia 1.10

[mkitti]

Here we employ a simplified @public macro that works for all uses in this repository.

The effectiveness of the public macro is confirmed in testing.

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All modified and coverable lines are covered by tests ✅

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@@           Coverage Diff           @@
##             main      #32   +/-   ##
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  Coverage   91.64%   91.64%           
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  Files          28       28           
  Lines        1185     1185           
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  Hits         1086     1086           
  Misses         99       99           

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[nhz2]

The recommended way is to do VERSION >= v"1.11.0-DEV.469" && eval(Meta.parse("public a, b, c"))
https://docs.julialang.org/en/v1.13-dev/manual/modules/#Export-lists

Also, ideally, the other packages don't need to import new things from Core for this.

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[mkitti]

I'm aware of that but it does it is not very easy to use, read, or maintain. Meta.parse also only works on a single line of code, so we might need to repeat it for every single line of public statements that you want to make or compact things into a single line.

The way @LilithHafner phrased this in JuliaLang/julia#55097 is this was just an alternative rather than a recommendation.

While that and the more complicated macros in Public.jl and Compat.jl do handle a more complicated case of nested macro calls, you do not do that here at all.

The Expr(:public, ...) is documented here:
https://docs.julialang.org/en/v1.13-dev/devdocs/ast/#Imports-and-such

I will also note that Core.Expr is marked as public but Meta.parse is not in Julia 1.11. I think it might become public in Julia 1.12, so pick your poison here.

I do not have a clear vision of how you would want this to be implemented otherwise. My best guess is a if statement in every package that uses this and an eval(Meta.parse(...)) for every line of public usage? Maybe we should consolidate into a single public statement per package, each identifier on each line?

don't need to import new things from Core for this.

I'm unclear whether you meant Core or ChunkCodecsCore.

I have relaxed the the version bound to match so far.

Feel free to branch off or start again if you have e a clear vision of how you think it should look. Otherwise, I will try to address it once I get more feedback from you.

[LilithHafner]

I recommend depending on Compat.jl rather than re-inventing the wheel here but there's nothing fundamentally wrong with this approach.

[LilithHafner]

Suggested change

	macro public(s::Symbol)
	return esc(Expr(:public, s))
	end
	macro public(e::Expr)
	return esc(Expr(:public, e.args...))
	end
	else
	macro public(e) end
	macro var"public"(s::Symbol)
	return esc(Expr(:public, s))
	end
	macro var"public"(e::Expr)
	return esc(Expr(:public, e.args...))
	end
	else
	macro var"public"(e) end

Public is a keyword so it is best to protect it with var. (the same way you would have to write an @export macro).

[mkitti]

Added another iteration on this in #33