Release v0.13.0

[skydread1]

v0.13.0 - 2026-09-09

nos build copies a library's C# assemblies into the build output, so shipping a compiled assembly to Unity takes no hand-written File/Copy, and Unity imports the plugin once instead of on every build. Saving a .clj, .cljc or .cljr re-evaluates it in the ClojureCLR Editor, on the one save rather than the third.

nos build also compiles with *unchecked-math* false, Clojure's default, so arithmetic and a narrowing cast throw on overflow instead of wrapping silently. Fifteen fixes across the compiler, runtime, stdlib and Mage align behaviour with JVM Clojure and ClojureCLR. The Editor runs ClojureCLR 1.11.0-flybot5.

Compiler

• Calling something that is not a function throws a catchable InvalidCastException, the way JVM Clojure throws ClassCastException, instead of InvalidProgramException: Invalid IL code. The compiler boxes a value-typed callee before casting it to IFn, so the method it lands in verifies; (1 2) and (let [x (int 1)] (x 2)) each produced a method the JIT refused to load - #171.
• deftype, reify and proxy bind a method to the slot it overrides rather than to one declaration of it, so a type can implement an interface that redeclares an inherited member. Writing count on clojure.lang.IPersistentMap used to fail with No match binding method, and naming the interface to get past it left the sibling declarations throwing NotImplementedException at run time. A return type hint on the method name picks between overloads that differ only in return type, as it does on ClojureCLR, and the compiler names the choices when the hint is missing - #146.
• A narrowing cast on a type-hinted primitive throws when the value does not fit instead of discarding the high bits, so (int 4294967296) on a ^long throws ArgumentException rather than returning 0, as on ClojureCLR and JVM Clojure - #148.
• A cast on a numeric literal behaves like the same cast at runtime: (int 1.5) returns 1 instead of 2, and an out-of-range literal like (int 4294967296) throws a catchable ArgumentException at runtime instead of aborting compilation with a bare OverflowException - #153.

Runtime

• Casting a boxed UInt64 converts instead of throwing InvalidCastException, so (int (identity (ulong 1))) returns 1 - #151.

Stdlib

• spit and writer truncate the file they overwrite, and :append appends, matching the JVM. A write used to open at position 0 without truncating, so shorter content produced a mix of new and old bytes, and :append was silently dropped - #155.
• #object[...] prints the qualified type name, so (pr-str (System.Text.StringBuilder.)) names System.Text.StringBuilder instead of StringBuilder. print-tagged-object wrote .Name, which drops the namespace and cannot identify a type, while print-method on the type object already wrote .FullName - #142.
• pr-str of an exception writes the :message value, so #error output carries the message instead of a bare :message key with nothing after it. The :via map was left with an odd number of forms - #158.
• defn records the qualified type name in an arglist :tag, so a hint like ^Regex is stored as System.Text.RegularExpressions.Regex and resolves from any namespace instead of only where the import is in scope - #162.
• sort and sort-by carry the collection's metadata through to the sorted seq - #163.
• A namespace map prints its keys in the map's own order, so #:a{...} no longer reorders them once the map outgrows an array-map - #165.
• clojure.pprint/pprint writes collection metadata when *print-meta* is true, so a pretty-printed value carries its metadata like pr does - #166.
• clojure.repl/doc prints a special form's docstring once instead of repeating it after the "Please see" line - #167.
• clojure.string/split drops trailing empty strings, and a negative limit returns every part. (split "a b " #" ") returned ["a" "b" ""]. split-lines gained a final "" on a trailing newline, and the negative limit threw. A pattern that matches nothing at the start no longer adds a leading "", so (split "abc" #"") returns ["a" "b" "c"] - #174.

Mage

• il/type's short arities work, so a caller can write (il/type "Name" body) instead of spelling out attributes, interfaces, supertype, generic parameters and custom attributes every time. Every arity below the 7-arity threw ArityException - #143.

Nostrand

• nos build compiles with *unchecked-math* false, Clojure's default, so arithmetic and narrowing casts keep their overflow checks instead of wrapping silently. A namespace that wants wrapping sets the flag itself - #149.
• nos build copies the C# assemblies a library ships into the output dir, so a consumer no longer writes its own File/Copy to get them there. Point :csharp-out at a second dir to keep them out of :out, which :clean? deletes on every build: Unity then imports the plugin once and its GUID holds, instead of a new one on every build - #144.

Unity

• The Editor loads ClojureCLR 1.11.0-flybot5, so both Editor runtimes agree on the stdlib fixes it carries. spit and writer truncate the file they overwrite, a printed double reads back equal, and (long x) on a boxed UInt64 converts. clojure.string/split drops trailing empty strings, a stack frame names the code that ran, and a string, map or record hashes to the JVM's value - clojure-1.11.0-flybot4, clojure-1.11.0-flybot5.
• The package ships Magic.Unity.ClojureReloader, so saving a .clj, .cljc or .cljr re-evaluates it in the ClojureCLR Editor on the one save. A consumer's own FileSystemWatcher hook fires two or three events per save, so a reload took several saves before - #157.