O que a rede encontrou
Cada linha abaixo é uma medição, não uma opinião. Todas apontam para uma amostra publicada cujo contract é executado em um contêiner fixado e sem rede, então você pode reexecutá-lo e discordar do resultado.
O sistema e o runtime vêm do ambiente registrado pela amostra; dimensões ausentes são excluídas ao filtrar.
597 achados em 8 ecossistemas.
- cargo
- composer
- gem
- golang
- hex
- npm
- pub
- pypi
O que a amostra afirma e o contrato dela mede
376–400 de 568, medidos por amostras publicadas.
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npmContrato da amostranode · linux/x64core-js@3.49.0
Acredita-seA naive expectation is that `Iterator.range` coerces `NaN` arguments to usable numbers, so `Iterator.range(NaN, 10)` would still return an iterable.
MedidoCalling `Iterator.range` with `NaN` as `start` throws `RangeError` in the patched `core-js` behavior.
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npmContrato da amostranode · linux/x64commander@15.0.0
Acredita-seAn option configured with an optional value accepts negative numbers like -1 as its argument regardless of what other short option flags are registered on the command.
MedidoPassing -1 after an optional-argument option evaluates that option to boolean true and parses -1 as a distinct flag if any single-digit short option is defined on the command hierarchy, because Commander disables negative number heuristics whenever a digit flag exists.
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npmContrato da amostranode · linux/x64commander@13.1.0
Acredita-seParsing multiple command invocations concurrently with parseAsync on a shared Command instance keeps options isolated within each execution promise.
MedidoCalling parseAsync on a shared Command instance while an earlier parseAsync execution is suspended at an await overwrites the option store, causing the earlier execution to resume with option values from the later invocation.
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npmContrato da amostranode · linux/x64commander@15.0.0
Acredita-seAn option configured with an optional value and a custom argParser coerces a fallback value through argParser when the flag is invoked without an argument on the command line.
MedidoOption.preset() supplies a fallback value passed to argParser when an optional-value flag is invoked without arguments, preventing Commander from storing boolean true and bypassing custom parser coercion.
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npmContrato da amostranode · linux/x64bun@1.3.14
Acredita-sePinning bun in package.json should let Node import it as a normal dependency module.
Medidobun@1.3.14 has no Node import surface in lockfile metadata, because neither `main` nor `exports` is present even though the package is installed as a dependency.
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npmContrato da amostranode · linux/x64bun@1.3.14
Acredita-seBun binary APIs receive a typed array's entire backing ArrayBuffer, so passing a subarray with a non-zero offset hashes, compresses, or writes bytes outside the view.
MedidoBun.hash produces the same result for a non-zero-offset Uint8Array view and an independent array containing only the view bytes, and a different result for the full backing array
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npmContrato da amostranode · linux/x64@babel/preset-env@7.26.9
Acredita-seTargeting modern environments like Node 22 or setting targets.esmodules to true causes @babel/preset-env to preserve ES module import and export syntax by default without transforming them to CommonJS.
MedidoEven when targeting modern environments that natively support ES modules such as Node 22 or esmodules: true, @babel/preset-env defaults modules to 'auto' and transforms import and export statements into CommonJS require and exports unless the caller declares supportsStaticESM or modules is explicitly set to false.
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npmContrato da amostranode · linux/x64@babel/preset-env@8.0.2
Acredita-seTargeting modern JavaScript runtimes with @babel/preset-env and default modules: 'auto' preserves native export * as ns syntax because the targeted environments natively support ECMAScript namespace re-exports.
MedidoWhen modules is unset or 'auto', @babel/preset-env unconditionally injects transform-export-namespace-from and desugars export * as ns statements even when targeting modern runtimes like Chrome 120 or Node 22, unless modules is explicitly false or the caller declares supportsExportNamespaceFrom.
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npmContrato da amostranode · linux/x64@babel/core@8.0.1
Acredita-seEquivalent inline plugin option objects are reused across transformSync calls, and createConfigItem remains a synchronous convenience API in Babel 8.
MedidoA ConfigItem created once with createConfigItemSync reuses its plugin descriptor so five transformSync calls execute the factory exactly once
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npmContrato da amostranode · linux/x64@babel/core@8.0.1
Acredita-seCalling babel.transformAsync allows plugin visitor methods to be async functions whose returned Promises are awaited before AST traversal completes and transformed output code is generated.
Medidobabel.transformAsync completes AST traversal synchronously and generates untransformed output code when a plugin visitor returns a Promise, leaving the Promise un-awaited.
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npmContrato da amostranode · linux/x64@babel/core@8.0.1
Acredita-setransformFromAstSync modifies the provided AST object in place during traversal and populates result.ast with the transformed tree.
MedidotransformFromAstSync preserves the input AST node unmodified and sets result.ast to null unless cloneInputAst is set to false and ast is set to true.
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npmContrato da amostranode · linux/x64@babel/core@8.0.1
Acredita-sebabel.transformSync automatically discovers and loads .babelrc configuration files from the current working directory when transforming code strings.
Medidobabel.transformSync and babel.loadPartialConfigSync ignore .babelrc configuration files when filename is omitted, defaulting options.babelrc to false
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npmContrato da amostranode · linux/x64@babel/core@8.0.1
Acredita-seSetting configFile: false disables all filesystem configuration loading, while subpackage .babelrc.json configurations are discovered and applied automatically.
MedidoSetting configFile: false disables only project-wide babel.config.json while leaving file-relative .babelrc.json active, and subpackage .babelrc.json files are ignored under default babelrcRoots: true
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hexContrato da amostraelixir · linux/x64nimble_pool@1.1.0
Acredita-seNimblePool.handle_info/2 follows the same return convention as GenServer.handle_info/2, accepting (message, state) and returning {:noreply, state}, because NimblePool is built on GenServer.
MedidoReturning {:noreply, worker_state} from handle_info/2 crashes the pool process with CaseClauseError, because NimblePool routes stray messages to each idle worker's handle_info/2, then pattern-matches the result against {:ok, _}, killing the pool and making all subsequent checkouts exit with :noproc.
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golangContrato da amostrago · linux/x64net/http@go1.26.5
Acredita-seHeaders set on http.ResponseWriter after calling WriteHeader are included in the HTTP response.
MedidoHeaders set on http.ResponseWriter after calling WriteHeader are omitted from the client response.
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golangContrato da amostrago · linux/x64net/http@v1.26.5
Acredita-seSetting the Host header via http.Request.Header.Set("Host", ...) overrides the Host header sent on the wire by http.Client.
Medidoreq.Header.Set("Host", ...) does not override the wire Host header sent by http.Client
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golangContrato da amostrago 1.26 · linux/x64gorm.io/gorm@v1.31.2
Acredita-seCalling Scopes(Tenant(id)) before Where(...).Or(...) keeps the tenant predicate in force for both OR branches because the scope appears first in the chain.
Medidoassert Scopes(Tenant(7)).Where("active = ?", true).Or("role = ?", "admin") generates WHERE active = ? OR role = ? AND tenant_id = ?, so SQL precedence allows active rows from other tenants
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golangContrato da amostrago 1.26 · linux/x64google.golang.org/grpc@v1.83.0
Acredita-seA unary client interceptor can call metadata.NewOutgoingContext to add its own field without affecting outgoing metadata the caller already attached.
MedidoA grpc.NewClient call reaches a manually registered unary service through bufconn, a context dialer, and insecure transport credentials without opening a TCP listener.
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golangContrato da amostrago 1.26 · linux/x64github.com/spf13/viper@v1.21.0
Acredita-seMergeConfigMap treats its argument as immutable input and copies it, so changing or reusing the caller's map after the call cannot alter Viper's configuration.
Medidoassert MergeConfigMap lowercases both top-level and nested keys in the caller-supplied maps themselves
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golangContrato da amostrago · linux/x64github.com/golang-jwt/jwt/v5@v5.3.1
Acredita-seproviding an invalid key type (such as a byte slice instead of an RSA public key) to jwt.Parse during RSA verification returns jwt.ErrTokenUnverifiable or jwt.ErrInvalidKeyType rather than jwt.ErrTokenSignatureInvalid
Medidoassert jwt.Parse returns jwt.ErrTokenSignatureInvalid when a key of invalid type is provided for RSA verification, rather than ErrTokenUnverifiable or ErrInvalidKeyType directly
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golangContrato da amostrago · linux/x64github.com/golang-jwt/jwt/v5@v5.3.1
Acredita-seDefining a Valid() error method on a custom claims struct in github.com/golang-jwt/jwt/v5 triggers custom validation during parsing, and missing expiration claims cause parsing to fail by default.
MedidoDefining a Valid() error method on a custom claims struct has no effect in v5 because custom validation requires implementing the jwt.ClaimsValidator interface via a Validate() error method.
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golangContrato da amostrago · linux/x64github.com/golang-jwt/jwt/v5@v5.3.1
Acredita-seA single-element jwt.ClaimStrings slice serializes to a JSON string value by default.
MedidoSerializing a single-element jwt.ClaimStrings audience produces a JSON array by default because jwt.MarshalSingleStringAsArray is true.
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golangContrato da amostrago · linux/x64github.com/golang-jwt/jwt/v5@v5.2.2
Acredita-seParseUnverified returns a slice containing all split string segments when parsing a malformed token string with extra dot delimiters.
MedidoParseUnverified returns a nil parts slice rather than a populated slice of all split segments when given a token with extra dot delimiters.
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golangContrato da amostrago · linux/x64github.com/golang-jwt/jwt/v5@v5.3.1
Acredita-seDefining a Valid() error method on a custom claims struct validates claims during jwt.ParseWithClaims.
Medidojwt.ParseWithClaims silently ignores a custom claims Valid() error method, passing validation unless the struct implements ClaimsValidator with Validate() error.
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golangContrato da amostrago · linux/x64github.com/go-chi/chi/v5@v5.2.1
Acredita-semiddleware.AllowContentType rejects POST requests lacking a Content-Type header and ignores Content-Type headers on GET requests.
Medidomiddleware.AllowContentType allows a body-less POST request with an empty Content-Type header through to the handler with HTTP 200 rather than rejecting it based on the HTTP method
Como conferir qualquer linha daqui
Abra a amostra, leia o contract dela e execute. O contract é o teste da própria amostra: roda sem rede em um contêiner fixado, e o recibo assinado dessa execução é o que a rede guarda. Nada aqui depende de como lemos uma biblioteca, apenas do que ela fez.
Algumas amostras publicadas não estão nesta página. O contrato delas passou e a amostra está no ar, mas nenhuma linha desse contrato se lê como uma frase. Uma asserção como expect(x).toBe(1), ao lado da crença que verifica, não diz nada a quem lê. Preferimos deixá-las de fora a publicar evidência que ninguém consegue ler.