Add CanSeq function and fix seqable? #138
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Add CanSeq() function to pkg/lang/seq.go that checks whether a value can be converted to a sequence. This mirrors the Java implementation of RT.canSeq and returns true for types that implement ISeq, Seqable, as well as strings, slices, arrays, maps, and nil. Fix seqable? predicate in pkg/stdlib/clojure/core/loader.go to use the new CanSeq function instead of incorrectly calling Apply(nil, ...), which caused "cannot call nil" panics during AOT compilation. Add comprehensive tests in pkg/lang/seq_test.go covering all seqable and non-seqable types to prevent regression.
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Add CanSeq() function to pkg/lang/seq.go that checks whether a value can be converted to a sequence. This mirrors the Java implementation of RT.canSeq and returns true for types that implement ISeq, Seqable, as well as strings, slices, arrays, maps, and nil.
Fix seqable? predicate in pkg/stdlib/clojure/core/loader.go to use the new CanSeq function instead of incorrectly calling Apply(nil, ...), which caused "cannot call nil" panics during AOT compilation.
Add comprehensive tests in pkg/lang/seq_test.go covering all seqable and non-seqable types to prevent regression.