{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:7C3DWQN3U6RT2NZIWE5XJ2KOT6","short_pith_number":"pith:7C3DWQN3","canonical_record":{"source":{"id":"1809.04209","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PL","submitted_at":"2018-09-12T00:58:55Z","cross_cats_sorted":[],"title_canon_sha256":"cd8d91433863b7130d3942060c7b2566b154ccb0a1bdd066b8fdccbb4a742635","abstract_canon_sha256":"74bf9458fed66780d096b70a615db252790f5ce24aa3b32acf27a543a63e5580"},"schema_version":"1.0"},"canonical_sha256":"f8b63b41bba7a33d3728b13b74e94e9fa8e675430dd5c069a825c3280d385c7c","source":{"kind":"arxiv","id":"1809.04209","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.04209","created_at":"2026-05-18T00:02:49Z"},{"alias_kind":"arxiv_version","alias_value":"1809.04209v2","created_at":"2026-05-18T00:02:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.04209","created_at":"2026-05-18T00:02:49Z"},{"alias_kind":"pith_short_12","alias_value":"7C3DWQN3U6RT","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"7C3DWQN3U6RT2NZI","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"7C3DWQN3","created_at":"2026-05-18T12:32:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:7C3DWQN3U6RT2NZIWE5XJ2KOT6","target":"record","payload":{"canonical_record":{"source":{"id":"1809.04209","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PL","submitted_at":"2018-09-12T00:58:55Z","cross_cats_sorted":[],"title_canon_sha256":"cd8d91433863b7130d3942060c7b2566b154ccb0a1bdd066b8fdccbb4a742635","abstract_canon_sha256":"74bf9458fed66780d096b70a615db252790f5ce24aa3b32acf27a543a63e5580"},"schema_version":"1.0"},"canonical_sha256":"f8b63b41bba7a33d3728b13b74e94e9fa8e675430dd5c069a825c3280d385c7c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:02:49.074352Z","signature_b64":"rmzS445n0clW319RsYCe643gLmN2QIkZAUx2+bL88Uej8pDmr1/RKIKaaAz3RkjLA/GlijE0AtQ0xCLrTIj1CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f8b63b41bba7a33d3728b13b74e94e9fa8e675430dd5c069a825c3280d385c7c","last_reissued_at":"2026-05-18T00:02:49.073707Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:02:49.073707Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.04209","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:02:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WflhI9GXZvP8JahUByERa3cDp2GsZ3zA71GFbYOuCmrxYt2UV0s17Zqx++V4p0wOhToVYP0T53tVORkyxXhABw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T03:59:24.698212Z"},"content_sha256":"91bb6350b6f2eb75d231f08314d95840d2eb1496113e87f68181103853ddc5fc","schema_version":"1.0","event_id":"sha256:91bb6350b6f2eb75d231f08314d95840d2eb1496113e87f68181103853ddc5fc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:7C3DWQN3U6RT2NZIWE5XJ2KOT6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Bidirectional Evaluation with Direct Manipulation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.PL","authors_text":"Mika\\\"el Mayer, Ravi Chugh, Viktor Kun\\v{c}ak","submitted_at":"2018-09-12T00:58:55Z","abstract_excerpt":"We present an evaluation update (or simply, update) algorithm for a full-featured functional programming language, which synthesizes program changes based on output changes. Intuitively, the update algorithm retraces the steps of the original evaluation, rewriting the program as needed to reconcile differences between the original and updated output values. Our approach, furthermore, allows expert users to define custom lenses that augment the update algorithm with more advanced or domain-specific program updates.\n  To demonstrate the utility of evaluation update, we implement the algorithm in"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.04209","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:02:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZX5Tw94Ps5/m/5TbPOekN+YinUUVfjxwEP5O1vY093unNHp3z/bta1BUaQ7lDkMB1j3eObkKPX2BjNSJ6OP1Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T03:59:24.698575Z"},"content_sha256":"535da5f33ef020fb29cb2ef9c6c49ff84c6d570716b141e73cc00a8bc3dde6ee","schema_version":"1.0","event_id":"sha256:535da5f33ef020fb29cb2ef9c6c49ff84c6d570716b141e73cc00a8bc3dde6ee"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7C3DWQN3U6RT2NZIWE5XJ2KOT6/bundle.json","state_url":"https://pith.science/pith/7C3DWQN3U6RT2NZIWE5XJ2KOT6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7C3DWQN3U6RT2NZIWE5XJ2KOT6/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-23T03:59:24Z","links":{"resolver":"https://pith.science/pith/7C3DWQN3U6RT2NZIWE5XJ2KOT6","bundle":"https://pith.science/pith/7C3DWQN3U6RT2NZIWE5XJ2KOT6/bundle.json","state":"https://pith.science/pith/7C3DWQN3U6RT2NZIWE5XJ2KOT6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7C3DWQN3U6RT2NZIWE5XJ2KOT6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:7C3DWQN3U6RT2NZIWE5XJ2KOT6","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"74bf9458fed66780d096b70a615db252790f5ce24aa3b32acf27a543a63e5580","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PL","submitted_at":"2018-09-12T00:58:55Z","title_canon_sha256":"cd8d91433863b7130d3942060c7b2566b154ccb0a1bdd066b8fdccbb4a742635"},"schema_version":"1.0","source":{"id":"1809.04209","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.04209","created_at":"2026-05-18T00:02:49Z"},{"alias_kind":"arxiv_version","alias_value":"1809.04209v2","created_at":"2026-05-18T00:02:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.04209","created_at":"2026-05-18T00:02:49Z"},{"alias_kind":"pith_short_12","alias_value":"7C3DWQN3U6RT","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"7C3DWQN3U6RT2NZI","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"7C3DWQN3","created_at":"2026-05-18T12:32:11Z"}],"graph_snapshots":[{"event_id":"sha256:535da5f33ef020fb29cb2ef9c6c49ff84c6d570716b141e73cc00a8bc3dde6ee","target":"graph","created_at":"2026-05-18T00:02:49Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We present an evaluation update (or simply, update) algorithm for a full-featured functional programming language, which synthesizes program changes based on output changes. Intuitively, the update algorithm retraces the steps of the original evaluation, rewriting the program as needed to reconcile differences between the original and updated output values. Our approach, furthermore, allows expert users to define custom lenses that augment the update algorithm with more advanced or domain-specific program updates.\n  To demonstrate the utility of evaluation update, we implement the algorithm in","authors_text":"Mika\\\"el Mayer, Ravi Chugh, Viktor Kun\\v{c}ak","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PL","submitted_at":"2018-09-12T00:58:55Z","title":"Bidirectional Evaluation with Direct Manipulation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.04209","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:91bb6350b6f2eb75d231f08314d95840d2eb1496113e87f68181103853ddc5fc","target":"record","created_at":"2026-05-18T00:02:49Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"74bf9458fed66780d096b70a615db252790f5ce24aa3b32acf27a543a63e5580","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PL","submitted_at":"2018-09-12T00:58:55Z","title_canon_sha256":"cd8d91433863b7130d3942060c7b2566b154ccb0a1bdd066b8fdccbb4a742635"},"schema_version":"1.0","source":{"id":"1809.04209","kind":"arxiv","version":2}},"canonical_sha256":"f8b63b41bba7a33d3728b13b74e94e9fa8e675430dd5c069a825c3280d385c7c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f8b63b41bba7a33d3728b13b74e94e9fa8e675430dd5c069a825c3280d385c7c","first_computed_at":"2026-05-18T00:02:49.073707Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:02:49.073707Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rmzS445n0clW319RsYCe643gLmN2QIkZAUx2+bL88Uej8pDmr1/RKIKaaAz3RkjLA/GlijE0AtQ0xCLrTIj1CQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:02:49.074352Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.04209","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:91bb6350b6f2eb75d231f08314d95840d2eb1496113e87f68181103853ddc5fc","sha256:535da5f33ef020fb29cb2ef9c6c49ff84c6d570716b141e73cc00a8bc3dde6ee"],"state_sha256":"6d81ac7daf85cc901c80c9714b24ec7c21409b48309c2b3f9e79f6e3dab9ffa3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"36atqnGNEZuPSyODrKWrCOEEj/I3nkSFv6tb33qMpk9btnNzNReXJG2Dmm1E/lv7kp++zvAPB2bHZjofGLF7DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T03:59:24.700610Z","bundle_sha256":"6dc1fb9848a8b14a441f3a66666878c62ca797a6979b136f98f5726af386076e"}}