Generated by tools/ownership/report_return_titles.py from a build run with CAJETA_AUDIT_RETURN_TITLES=1. Plan item 8.1.1; see specs/stdlib-ownership-convention-spec.md.

The numbers are the COMPILER’s decision at each return (ReturnStatement::generateCode’s returnTitleFlag), not a source-shape classification. Coverage is what the harvested builds compiled: a method no build reached is a method nobody measured.

Measure	Count
Plain-return, class-returning methods compiled	424
…of those, methods whose return can carry a title	32
Ride-through rate	7.5%

By mechanism

Mechanism	Methods	What the caller sees
`call-ride`	31	tail-calls a plain-return method; the decision is deferred one more frame (the fluent-builder chain)
`call-ride#`	2	tail-calls a method that DECLARES `#`; a title rides out through a signature that says borrow — the `viaPlain` shape

Coverage

One row per harvested build. Every build ran to completion, so the denominator above is a CENSUS of what these libraries compile — the only remaining coverage limit is stdlib methods no library reaches.

Harvest	Plain returns seen	Title notes	Ran to completion
`cajeta-codec.stderr`	230	54	yes
`cajeta-http.stderr`	388	66	yes
`cajeta-logging.stderr`	246	58	yes
`cajeta-ml.stderr`	616	123	yes
`cajeta-timeseries.stderr`	535	103	yes

By package

Package	Ride-through methods
`cajeta.codec.json`	5
`cajeta.nucleo.frame`	1
`cajeta.reflect`	1
`dev.cajeta.codec.ion`	2
`dev.cajeta.http.body`	3
`dev.cajeta.http.client`	1
`dev.cajeta.http.h2`	2
`dev.cajeta.http.sse`	1
`dev.cajeta.http.ws`	4
`dev.cajeta.logging`	1
`dev.cajeta.ml.io`	4
`dev.cajeta.ml.linear`	1
`dev.cajeta.ml.nn`	3
`dev.cajeta.ml.train`	2
`dev.cajeta.ml.zoo`	1

Every site

One row per return. A generic method compiled against several element types is ONE row — the instantiations agree on the stance, and the extra return type is noted rather than repeated.

Method	Line	Carry	Via	Returns
`cajeta.codec.json.JsonObject.get`	109	runtime	`call-ride`	`cajeta.codec.json.JsonValue`
`cajeta.codec.json.JsonObject.get`	111	runtime	`call-ride`	`cajeta.codec.json.JsonValue`
`cajeta.codec.json.JsonValue.setString`	227	runtime	`call-ride`	`cajeta.codec.json.JsonValue`
`cajeta.codec.json.JsonValue.setString`	229	runtime	`call-ride`	`cajeta.codec.json.JsonValue`
`cajeta.codec.json.JsonWriter.key`	307	runtime	`call-ride`	`cajeta.codec.json.JsonWriter`
`cajeta.codec.json.JsonWriter.key`	309	runtime	`call-ride`	`cajeta.codec.json.JsonWriter`
`cajeta.codec.json.JsonWriter.writeString`	275	runtime	`call-ride`	`cajeta.codec.json.JsonWriter`
`cajeta.codec.json.JsonWriter.writeString`	277	runtime	`call-ride`	`cajeta.codec.json.JsonWriter`
`cajeta.codec.json.JsonWriter.writeValue`	374	runtime	`call-ride`	`cajeta.codec.json.JsonWriter`
`cajeta.codec.json.JsonWriter.writeValue`	377	runtime	`call-ride`	`cajeta.codec.json.JsonWriter`
`cajeta.codec.json.JsonWriter.writeValue`	381	runtime	`call-ride`	`cajeta.codec.json.JsonWriter`
`cajeta.codec.json.JsonWriter.writeValue`	383	runtime	`call-ride`	`cajeta.codec.json.JsonWriter`
`cajeta.codec.json.JsonWriter.writeValue`	386	runtime	`call-ride`	`cajeta.codec.json.JsonWriter`
`cajeta.codec.json.JsonWriter.writeValue`	412	runtime	`call-ride`	`cajeta.codec.json.JsonWriter`
`cajeta.nucleo.frame.SortKey.name`	98	runtime	`call-ride`	`cajeta.lang.String`
`cajeta.nucleo.frame.SortKey.name`	99	runtime	`call-ride`	`cajeta.lang.String`
`cajeta.nucleo.frame.SortKey.name`	100	runtime	`call-ride`	`cajeta.lang.String`
`cajeta.reflect.TemplateArgument.getType`	67	runtime	`call-ride`	`cajeta.reflect.Class<?>`
`dev.cajeta.codec.ion.IonCursor.readSymbol`	166	runtime	`call-ride`	`cajeta.lang.String`
`dev.cajeta.codec.ion.IonSymbolTable.resolve`	56	runtime	`call-ride`	`cajeta.lang.String`
`dev.cajeta.http.body.MultipartBody.addField`	167	runtime	`call-ride`	`dev.cajeta.http.body.MultipartBody`
`dev.cajeta.http.body.MultipartBody.addFile`	174	runtime	`call-ride`	`dev.cajeta.http.body.MultipartBody`
`dev.cajeta.http.body.MultipartPart.contentType`	148	runtime	`call-ride`	`dev.cajeta.http.MediaType`
`dev.cajeta.http.client.ConnectionPool.lockedEntryFor`	176	runtime	`call-ride`	`dev.cajeta.http.client.OriginEntry`
`dev.cajeta.http.h2.HpackDecoder.nameForIndex`	142	runtime	`call-ride`	`cajeta.lang.String`
`dev.cajeta.http.h2.HpackDecoder.nameForIndex`	146	runtime	`call-ride`	`cajeta.lang.String`
`dev.cajeta.http.h2.HpackDecoder.valueForIndex`	154	runtime	`call-ride`	`cajeta.lang.String`
`dev.cajeta.http.h2.HpackDecoder.valueForIndex`	158	runtime	`call-ride`	`cajeta.lang.String`
`dev.cajeta.http.sse.SseClient.lastEventId`	125	runtime	`call-ride`	`cajeta.lang.String`
`dev.cajeta.http.ws.WebSocket.peerCloseReason`	642	runtime	`call-ride`	`dev.cajeta.http.ws.WsCloseReason`
`dev.cajeta.http.ws.WebSocketConnection.subprotocol`	43	runtime	`call-ride`	`cajeta.lang.String`
`dev.cajeta.http.ws.WsMessageAssembler.accept`	185	runtime	`call-ride`	`dev.cajeta.http.ws.WsMessage`
`dev.cajeta.http.ws.WsMessageAssembler.accept`	216	runtime	`call-ride#`	`dev.cajeta.http.ws.WsMessage`
`dev.cajeta.http.ws.WsMessageAssembler.finishMessage`	305	runtime	`call-ride#`	`dev.cajeta.http.ws.WsMessage`
`dev.cajeta.logging.CapturingAppender.get`	31	runtime	`call-ride`	`cajeta.lang.String`
`dev.cajeta.ml.io.StateDict.get`	69	runtime	`call-ride`	`cajeta.math.Tensor<float32>`
`dev.cajeta.ml.io.StateDict.nameAt`	39	runtime	`call-ride`	`cajeta.lang.String`
`dev.cajeta.ml.io.StateDict.valueAt`	43	runtime	`call-ride`	`cajeta.math.Tensor<float32>`
`dev.cajeta.ml.io.Unpickler.topStr`	135	runtime	`call-ride`	`cajeta.lang.String`
`dev.cajeta.ml.linear.Lasso.coef`	52	runtime	`call-ride`	`cajeta.math.Tensor<float64>`
`dev.cajeta.ml.nn.LoraLinear.biasParam`	82	runtime	`call-ride`	`dev.cajeta.ml.nn.Parameter`
`dev.cajeta.ml.nn.LoraLinear.weightParam`	78	runtime	`call-ride`	`dev.cajeta.ml.nn.Parameter`
`dev.cajeta.ml.nn.Sequential.at`	35	runtime	`call-ride`	`dev.cajeta.ml.nn.Module`
`dev.cajeta.ml.train.SpelaTrainer.classVectorsAt`	163	runtime	`call-ride`	`cajeta.math.Tensor<float32>`
`dev.cajeta.ml.train.SpelaTrainer.layerAt`	156	runtime	`call-ride`	`dev.cajeta.ml.nn.Module`
`dev.cajeta.ml.zoo.EncoderStack.blockAt`	44	runtime	`call-ride`	`dev.cajeta.ml.nn.Module`

Source: docs/stdlib/return-title-audit.md · 4 min read · 881 words