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Intentional design decisions (not bugs)

ConvType only converts float64 -> int: Other type mismatches are caught by reflect.Call panic, which is recovered and reported as an error. No additional type validation is needed in ConvType.
handleCall assumes last return value is error: All API methods must return error as their last return value. This is enforced by the code generator (kitcom). The runtime does not re-validate this — registering a struct with non-conforming exported methods is a usage error.
Function.length used for arg count validation in TS: API methods must not use default parameters or rest parameters. This is a constraint of the IPC interface — all parameters are always sent explicitly over the wire.
Blob serialization is asymmetric between Go and TS: Go wraps blobs as {"t":"blob","d":"<base64>"}, TS sends bare base64 strings. This is handled by the generated code on each side (base64.DecodeString in Go templates, Buffer.from in TS templates). Direct Call() with blob args across languages requires matching the target's expected format.