网络测出了什么
下面每一行都是测量结果，不是观点。每一条都链接到一个已发布的样本，其 contract 在断网的固定容器中执行，你可以自己重跑并反驳结论。
操作系统和运行时来自所链接样本记录的环境；缺少该维度的条目会在筛选时排除。
597 条发现，覆盖 8 个生态。
- cargo
- composer
- gem
- golang
- hex
- npm
- pub
- pypi
样本自述，其契约实测
正在显示已发布样本测得的第 101–125 条(共 568 条)。
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gem样本契约ruby · linux/x64tzinfo-data@1.2026.3
普遍认为In European timezones such as Europe/Dublin, winter periods are standard time with dst? returning false and summer periods are daylight saving time with dst? returning true.
实测In Europe/Dublin under tzdata 2026c, winter periods have dst? set to true with a negative daylight saving offset of -3600 seconds (GMT) and summer periods have dst? set to false with standard offset 0 (IST), because Irish law defines IST (UTC+1) as standard time.
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golang样本契约go · linux/x64github.com/go-playground/validator/v10@v10.30.3
普遍认为A validation tag placed on a map field or after dive validates both map keys and map values, or applying min on a map validates element length rather than map entry count.
实测Tags before dive validate map collection entry count, tags between keys and endkeys validate each map key, and tags after endkeys validate each map value.
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npm样本契约node · linux/x64chalk@6.0.0
普遍认为Underline colors downsample to standard 2-digit 16-color ANSI codes at level 1 and are included in the default colorNames array like foreground and background styles.
实测Chalk v6 underline colors emit SGR 58 escape sequences with SGR 59 resets across all color levels, downsampling to palette-indexed SGR 58;5 codes at level 1 rather than 2-digit ANSI codes.
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golang样本契约go · linux/x64github.com/spf13/cobra@v1.10.2
普遍认为Defining PersistentPreRun on a subcommand or group executes in addition to ancestor PersistentPreRun hooks in hierarchical root-to-leaf order.
实测PersistentPreRun on a subcommand or group completely shadows ancestor PersistentPreRun hooks, executing only the nearest hook and skipping root initialization unless manually chained.
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golang样本契约go · linux/x64github.com/glebarez/sqlite@v1.11.0
普遍认为gorm.Open with the glebarez pure-Go sqlite dialector automatically translates database constraint violations to gorm.ErrDuplicatedKey or gorm.ErrForeignKeyViolated by default without setting TranslateError
实测sqlite.Dialector translates pure-Go gosqlite unique and foreign key constraint errors into gorm.ErrDuplicatedKey and gorm.ErrForeignKeyViolated when TranslateError is enabled, while returning raw driver errors when disabled
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pypi样本契约python · linux/x64protobuf@6.33.6
普遍认为Passing always_print_fields_with_no_presence=True to MessageToDict causes all proto3 message fields with default values to be included in the dictionary
实测MessageToDict with always_print_fields_with_no_presence=True includes default values only for scalar fields lacking presence, while unset proto3_optional and message fields with presence remain omitted
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pypi样本契约python · linux/x64polars-runtime-32@1.43.2
普遍认为A competent model would expect a package named polars-runtime-32 to expose a module named polars_runtime_32 or polars_runtime.
实测The package contains only binary libraries for the main polars package and attempting to import polars_runtime_32 raises a ModuleNotFoundError.
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npm样本契约node · linux/x64undici@8.10.0
普遍认为Exhausted retries on 5xx HTTP status codes return the final HTTP Response object with statusCode 503 rather than throwing an exception.
实测When retries on 5xx responses are exhausted, agent.request rejects with a RequestRetryError (code UND_ERR_REQ_RETRY) unless throwOnError is explicitly set to false to return the 503 Response.
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npm样本契约node · linux/x64date-fns@4.4.0
普遍认为differenceInBusinessDays from a weekend start to Monday returns 1 business day, and adding zero business days normalizes a weekend date to the next business day
实测differenceInBusinessDays from Saturday or Sunday to Monday returns 0 because no full business day elapsed, whereas Friday to Saturday returns 1
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gem样本契约ruby · linux/x64minitest@6.0.6
普遍认为Calling assert_same with nil compares identity using equal? and passes on nil values, while assert_raises accepts exception instances without raising a TypeError
实测assert_same(nil, value) raises Minitest::Assertion with "Use assert_nil if expecting nil" even when comparing nil to nil, enforcing explicit use of assert_nil for nil checks
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pypi样本契约python · linux/x64orjson@3.12.0
普遍认为orjson.loads transparently accepts UTF-8 byte order mark (BOM) prefixes, accepts stream and file-like objects, and orjson.dumps formats float NaN and Infinity as numeric literals matching standard library json.
实测orjson.loads explicitly rejects UTF-8 byte order marks (BOM) with JSONDecodeError rather than stripping them, and requires bytes-like buffers rejecting file streams with JSONDecodeError.
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pypi样本契约python · linux/x64fastapi@0.141.1
普遍认为Declaring a Header parameter in Python with snake_case matches the exact header name with underscores and splitting comma-separated headers into list types occurs automatically
实测Header parameters defined with underscores automatically translate to hyphenated HTTP header lookups unless convert_underscores is explicitly disabled, and multi-value header lists only capture distinct HTTP headers rather than splitting comma-separated values
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npm样本契约node · linux/x64postcss@8.4.49
普遍认为Ambiguous arbitrary utilities like text-[var(--size)] or font-[var(--family)] infer their target CSS property from the variable name rather than resolving to default color and font-weight declarations
实测Ambiguous utilities like text-[var(--size)] and font-[var(--family)] resolve CSS variables to color and font-weight properties by default, requiring explicit length: or family-name: data-type casting to generate font-size and font-family declarations
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pypi样本契约python · linux/x64greenlet@3.0.3
普遍认为Control implicitly returns to the greenlet that called switch(), behaving like a symmetric coroutine yield or regular function call
实测When greenlet B switches to greenlet C, and C finishes its execution, control returns to C's parent (its creator), rather than back to B that performed the switch
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npm样本契约node · linux/x64three@0.185.1
普遍认为Raycaster ignores invisible objects or their children and halts recursive descent through parent objects whose layer masks do not match the raycaster.
实测Raycaster.intersectObjects() returns intersections for objects with visible set to false and children of invisible parent groups, without filtering by scene visibility.
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golang样本契约go · linux/x64sigs.k8s.io/yaml@v1.6.0
普遍认为A YAML parsing and serialization library invokes custom UnmarshalYAML and MarshalYAML hook methods implemented on Go types when decoding and encoding YAML documents.
实测yaml.Unmarshal and yaml.Marshal bypass custom UnmarshalYAML and MarshalYAML methods on Go types, leaving UnmarshalYAML uncalled and falling back to json.Unmarshaler or standard JSON reflection.
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npm样本契约node · linux/x64jsdom@26.1.0
普遍认为HTML script tags and inline event handlers execute automatically in JSDOM, and any unhandled script exceptions throw synchronous runtime errors from the JSDOM constructor.
实测Instantiating JSDOM with default settings suppresses all inline script tags and inline event handlers, and window.eval throws a ReferenceError because no VM context is attached.
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pypi样本契约python · linux/x64protobuf@6.33.6
普遍认为Setting TEMPORARILY_DISABLE_PROTOBUF_VERSION_CHECK=1 in the environment disables protobuf gencode version validation during proto loading
实测Setting TEMPORARILY_DISABLE_PROTOBUF_VERSION_CHECK to '1' fails to bypass gencode version validation because the check strictly requires 'true', continuing to raise VersionError on newer gencode
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pypi样本契约python · linux/x64flask@3.1.3
普遍认为Setting APPLICATION_ROOT automatically prefixes route endpoints and dispatches incoming requests matching the configured root path.
实测Configuring APPLICATION_ROOT sets the session cookie path to the specified prefix and causes url_for to generate prefixed paths, but leaves request routing unprefixed so requests to the prefixed URL fail with 404 Not Found.
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golang样本契约go · linux/x64golang.org/x/sync@v0.22.0
普遍认为Configuring SetLimit(0) disables concurrency limits or safely rejects tasks, SetLimit can be updated dynamically at any time, and semaphore.Acquire immediately errors if requested weight exceeds capacity.
实测assert configuring SetLimit(0) deadlocks errgroup.Go calls immediately and causes TryGo to drop 100% of submitted tasks rather than enabling unlimited concurrency
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golang样本契约go · linux/x64gopkg.in/yaml.v3@v3.0.1
普遍认为yaml.Decoder.Decode ignores unrecognized keys by default, and developers expecting encoding/json semantics assume embedded anonymous struct fields are automatically inlined without explicit tags.
实测Enabling yaml.Decoder.KnownFields(true) returns a *yaml.TypeError reporting 'field <name> not found' for undeclared keys, un-inlined embedded struct fields, and yaml:"-" ignored fields, whereas default decoding silently discards them without error.
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npm样本契约node · linux/x64bcryptjs@3.0.3
普遍认为bcrypt.compareSync returns boolean false for any non-matching password hash and hash defaults to 10 rounds when the salt parameter is omitted
实测assert compareSync returns boolean false for mismatched hashes whose length is not 60, but throws an uncaught Error on 60-character invalid or unsupported revision strings, while async hash rejects with Illegal arguments unless rounds or salt is explicitly supplied
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golang样本契约go · linux/x64golang.org/x/sync@v0.22.0
普遍认为a weighted semaphore grants available capacity to incoming requests whenever unallocated tokens suffice, allowing small requests to bypass earlier larger queued waiters.
实测assert semaphore.Weighted enforces strict FIFO ordering so smaller Acquire requests remain blocked behind a larger head waiter even when sufficient unallocated tokens exist
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pub样本契约dart · linux/x64pool@1.5.1
普遍认为Configuring Pool with a timeout duration causes every queued resource request to time out after waiting for that duration while the pool is at capacity.
实测Pool timeout is a single-shot deadlock detector that permanently nullifies its timer after firing once, causing subsequent requests queued on a saturated pool to hang indefinitely without timing out.
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npm样本契约node · linux/x64ws@8.18.0
普遍认为Calling handleUpgrade on a WebSocketServer created with noServer: true automatically emits the connection event on the server instance.
实测WebSocketServer.prototype.handleUpgrade returns undefined, requires a callback to deliver the upgraded WebSocket instance, and does not automatically emit the connection event on the WebSocketServer instance.
如何核对这里的任何一行
打开样本，读它的 contract，然后运行。contract 就是该样本自己的测试：它在断网的固定容器中运行，那次运行的签名回执才是网络所存储的东西。这里没有一条依赖我们对某个库的理解，只依赖这个库实际做了什么。
有些已发布的样例不在这个页面上。它们的契约通过了，样例也是活的 —— 但契约里没有一行能当句子读。像 expect(x).toBe(1) 这样的断言，放在它所检验的那个认知旁边，对读者什么也没说。与其登出没人能读的证据，不如空着。