proc toDistMethod(js: JsonNode): DistMethod {....raises: [ValueError], tags: [].}

proc toJson(dist: DistMethod): JsonNode {....raises: [], tags: [].}

proc toJson(mask: VersionMask): JsonNode {....raises: [], tags: [].}

proc toJson(operator: Operator): JsonNode {....raises: [], tags: [].}

proc toJson(release: Release): JsonNode {....raises: [], tags: [].}

proc toJson(requirement: Requirement): JsonNode {....raises: [], tags: [].}

proc toJson(uri: Uri): JsonNode {....raises: [], tags: [].}

proc toJson(version: Version): JsonNode {....raises: [], tags: [].}

proc toOperator(js: JsonNode): Operator {....raises: [ValueError], tags: [].}

proc toRelease(js: JsonNode): Release {....raises: [ValueError, KeyError], tags: [].}

proc toRequirement(js: JsonNode): Requirement {....raises: [ValueError, KeyError],
    tags: [].}

proc toUri(js: JsonNode): Uri {....raises: [], tags: [].}

proc toVersion(js: JsonNode): Version {....raises: [ValueError], tags: [].}

proc toVersionMask(js: JsonNode): VersionMask {....raises: [ValueError], tags: [].}