ネットワークが見つけたもの
以下の各行は意見ではなく測定です。いずれも公開サンプルにリンクしており、その contract はネットワークを切った固定コンテナで実行されるので、自分で再実行して結果に反論できます。
OS とランタイムはリンク先サンプルに記録された環境です。その項目がない記録は選択時に除外されます。
597 件の発見、8 個のエコシステム。
- cargo
- composer
- gem
- golang
- hex
- npm
- pub
- pypi
サンプルが述べ、その契約が測ったこと
公開サンプルが測定した結果の 176–200 件目(全 568 件)。
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gemサンプル契約ruby · linux/x64mustermann@4.0.0
信じられていることMustermann pattern matching always requires full string matches, and string interpolation of pattern objects safely preserves named parameter boundaries without altering AST capture names.
測定結果Mustermann patterns anchored to string boundaries return nil on subpaths when using match or params, but peek_params performs unanchored prefix matching and returns both extracted params and the consumed character offset for stepwise sub-routing.
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golangサンプル契約go · linux/x64github.com/go-chi/chi/v5@v5.3.1
信じられていることmiddleware.Timeout enforces a hard wall-clock timeout by asynchronously aborting the handler and returning 504 Gateway Timeout even if the handler blocks or writes data.
測定結果When a handler cooperatively returns upon ctx.Done() without writing to ResponseWriter, middleware.Timeout writes HTTP 504 StatusGatewayTimeout with an empty body.
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gemサンプル契約ruby · linux/x64set@1.1.3
信じられていることSet#<=> provides a total ordering across any sets so arrays of sets can be sorted with Array#sort.
測定結果Set#<=> returns nil when neither set is a subset of the other, which causes Array#sort on incomparable sets to raise ArgumentError.
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pypiサンプル契約python · linux/x64six@1.17.0
信じられていることsix.b encodes any text to bytes and accepts existing bytes idempotently, six.u coerces bytes to str, and six.byte2int coerces integer inputs while defaulting empty bytes to zero
測定結果six.b strictly encodes strings using latin-1 raising UnicodeEncodeError on code points above 255 and AttributeError on existing bytes rather than coercing via UTF-8 or acting idempotently
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pypiサンプル契約python · linux/x64six@1.17.0
信じられていることAccessing moved attributes on six.moves or its classes returns the descriptor or resolved object identically without mutating class state, and six.remove_move cleans up import hooks alongside attribute access
測定結果Accessing an attribute on six.moves or its lazy namespaces resolves the target, caches it in the instance dictionary, and deletes the lazy descriptor from the class dictionary, making class-level attribute access fail with AttributeError
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golangサンプル契約go · linux/x64go.opentelemetry.io/otel/sdk@v1.45.0
信じられていることresource.Merge returns a nil Resource pointer when encountering an ErrSchemaURLConflict between resources with different schema URLs.
測定結果resource.Merge with conflicting non-empty schema URLs returns a non-nil Resource with SchemaURL set to empty string alongside ErrSchemaURLConflict while merging attributes
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golangサンプル契約go · linux/x64go.opentelemetry.io/otel@v1.28.0
信じられていることExtracting from a request with multiple traceparent headers ignores them completely as mandated by the W3C Trace Context specification.
測定結果Extracting from a HeaderCarrier with two traceparent headers yields the SpanContext of the first header rather than an invalid, empty context.
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pypiサンプル契約python · linux/x64six@1.17.0
信じられていることsix.reraise(tp, value, tb) accepts a string message as value and instantiates tp(value) like Python 2's raise statement, and six.raise_from(exc, None) retains implicit exception context.
測定結果six.reraise requires value to be an exception instance or None and raises AttributeError when passed a string message, unlike Python 2 raise syntax
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pypiサンプル契約python · linux/x64six@1.17.0
信じられていることsix.int2byte raises standard built-in ValueError or TypeError for invalid integer inputs like Python 2 chr() or Python 3 bytes constructor, and six.remove_move raises KeyError for nonexistent moves
測定結果six.int2byte raises struct.error rather than built-in ValueError or TypeError when passed out-of-range integers or non-integer types because it is implemented via struct.Struct.pack in Python 3
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pypiサンプル契約python · linux/x64pydantic@2.13.4
信じられていることPydantic models validate and coerce all field defaults against annotated types and constraints during default instantiation.
測定結果Leaving validate_default unset defaults to False: uncoerced string defaults remain raw strings and constraint-violating defaults are assigned directly without validation errors.
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pypiサンプル契約python · linux/x64pydantic@2.13.4
信じられていることSerializing a Pydantic model to JSON and parsing it back with model_validate_json preserves the original plaintext secret or raises a validation error.
測定結果model_dump_json masks SecretStr and SecretBytes to asterisks, and subsequent model_validate_json silently parses the mask string as the new secret value instead of preserving the secret or raising an error.
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golangサンプル契約go · linux/x64go.opentelemetry.io/otel/sdk@v1.45.0
信じられていることCapacity limits on a span apply a uniform dropping strategy, meaning both attributes and events would drop the newest entries or both would drop the oldest entries.
測定結果When AttributeCountLimit is 3 and five attributes are added in order a0…a4, span.Attributes() contains exactly the first three (a0, a1, a2), not the last three — new arrivals are silently dropped, not old ones.
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pypiサンプル契約python · linux/x64pydantic@2.13.4
信じられていることPassing a set of field names like {'members': {'secret'}} to model_dump(exclude=...) excludes that field from each nested model in a sequence.
測定結果Passing a bare field set like {'members': {'secret'}} to model_dump(exclude=...) silently leaves secrets present in nested sequence elements because collection keys represent item indices rather than attribute names.
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pubサンプル契約dart · linux/x64args@2.7.0
信じられていることArgResults returns an isolated or unmodifiable list for multi-option default values on each parse rather than sharing a mutable reference to the parser's internal default list.
測定結果ArgResults.multiOption returns the exact mutable defaultsTo list instance stored in Option without copying, causing identical() to return true across distinct parse calls and leaking in-place mutations into subsequent parses.
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npmサンプル契約node · linux/x64react@18.3.1
信じられていることstartTransition defers callback execution asynchronously or returns a Promise that keeps async continuations within the transition context.
測定結果startTransition executes its callback synchronously on the calling thread, returns undefined rather than a Promise, and resets ReactCurrentBatchConfig.transition to null immediately before returning so asynchronous continuations run outside the transition context.
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golangサンプル契約go · linux/x64go.opentelemetry.io/otel/sdk@v1.24.0
信じられていることParentBased(NeverSample()) disables span sampling across all spans created by the TracerProvider
測定結果ParentBased(NeverSample()) samples and exports child spans when the context contains a sampled remote parent, because ParentBased delegates sampled remote parents to AlwaysSample() by default rather than the configured root sampler.
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golangサンプル契約go · linux/x64go.opentelemetry.io/otel/sdk@v1.37.0
信じられていることAlwaysSample().Description() returns "AlwaysSample" and NeverSample().Description() returns "NeverSample" matching their Go constructor identifiers
測定結果AlwaysSample().Description() returns "AlwaysOnSampler" and NeverSample().Description() returns "AlwaysOffSampler" using OpenTelemetry specification names rather than Go constructor names
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pypiサンプル契約python · linux/x64httpx@0.28.1
信じられていることSubclassing Auth to inspect streaming request bodies or handle 401 challenge retries can be done by accessing request.content directly or yielding requests without explicit body buffering flags, and Authorization headers are automatically retained across all followed redirects.
測定結果Accessing request.content on streaming requests inside auth_flow raises RequestNotRead unless requires_request_body is set to True
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pypiサンプル契約python · linux/x64httpx@0.28.1
信じられていることConverting Headers and QueryParams to standard Python dictionaries preserves all multi-value items or maps duplicate keys to lists.
測定結果Converting Headers to a standard dictionary collapses duplicate header keys into a single comma-delimited string rather than preserving discrete wire occurrences or lists.
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pypiサンプル契約python · linux/x64httpx@0.28.1
信じられていることJoining a relative path to an httpx.URL always appends to the full path prefix of the base URL
測定結果httpx.URL.join on a base path lacking a trailing slash replaces the final path segment rather than appending to it
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npmサンプル契約node · linux/x64@babel/preset-env@7.26.0
信じられていることisPluginRequired accepts shorthand target versions such as chrome '80' matching Babel configuration presets, and returns false when targets is empty since no target platforms require compilation.
測定結果isPluginRequired throws a semver validation error when targets specifies a non-triplet version like '80' while support data allows '79', returns false when target version 80.0.0 meets support version 79, and returns true when targets is empty or includes unspecified environments.
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pypiサンプル契約python · linux/x64httpx@0.28.1
信じられていることhttpx.InvalidURL inherits from httpx.HTTPError and catching httpx.HTTPError catches URL formatting errors
測定結果httpx.InvalidURL inherits directly from builtins.Exception rather than httpx.HTTPError or httpx.RequestError, so catching httpx.HTTPError fails to catch URL validation failures.
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npmサンプル契約node · linux/x64express@4.21.0
信じられていることres.format requires handlers to set their own Content-Type header and falls back to a 200 response or uncaught exception when the Accept header is unmatched
測定結果res.format automatically sets the Vary: Accept header and pre-populates Content-Type matching the negotiated format before executing the handler
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npmサンプル契約node · linux/x64express@4.21.2
信じられていることrouter.param callbacks defined on a child router with mergeParams: true execute for all named parameters present in req.params during route handling.
測定結果Express router.param callbacks only execute when the parameter placeholder is declared in the matching route's own path pattern, ignoring inherited parameters populated on req.params by mergeParams: true.
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npmサンプル契約node · linux/x64express@5.2.1
信じられていることA good model would confidently expect that query parameters configured or named to represent collections will always parse as an array if present, or that ?id[]=1 syntax forces an array type.
測定結果req.query.id parses ?id=1 as the string '1', not an array.
ここの行を確かめる方法
サンプルを開き、contract を読み、実行してください。contract はそのサンプル自身のテストです。ネットワークを切った固定コンテナで実行され、その実行の署名済みレシートがネットワークに保存されます。ここに書かれていることはライブラリについての解釈ではなく、ライブラリが実際に行ったことだけに基づいています。
公開済みのサンプルのうち、このページにないものがあります。契約は通過しておりサンプルも生きていますが、その契約に文として読める行がないからです。expect(x).toBe(1) のような断言は、検査している思い込みの隣に置いても読者に何も伝えません。読めない証拠を載せるより、空けておくことを選びました。