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
76–100 de 568, medidos por amostras publicadas.
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gemContrato da amostraruby · linux/x64activesupport@8.1.3.1
Acredita-seActiveSupport::TimeZone#parse retains the parsed string's offset or assigns wall-clock time directly without zone conversion, and raises ArgumentError on invalid date strings like standard Time.parse.
MedidoActiveSupport::TimeZone#parse with an explicit UTC offset converts the instant into the receiver's time zone representation rather than retaining the string's offset or treating the wall-clock time as local.
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pypiContrato da amostrapython · linux/x64greenlet@3.5.4
Acredita-seA newly created greenlet automatically inherits the active contextvars context of the parent greenlet that spawned it, and setting context variables inside the greenlet alters the ambient context seen by the parent upon returning.
MedidoA newly created greenlet starts with gr_context as None and executes within a fresh isolated contextvars Context that does not inherit the caller greenlet's ContextVar values, unless a Context is explicitly assigned to gr_context prior to switching.
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golangContrato da amostrago · linux/x64gopkg.in/yaml.v3@v3.0.1
Acredita-seUnmarshaling a YAML mapping directly into *yaml.Node produces a MappingNode whose Content slice holds child values.
Medidoyaml.Unmarshal into *yaml.Node produces a root DocumentNode with Kind 1 whose Content slice wraps the top-level MappingNode (Kind 4) at index 0 rather than returning a MappingNode directly.
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npmContrato da amostranode · linux/x64ajv@8.20.0
Acredita-seSetting removeAdditional true in Ajv options strips all undeclared properties from validated objects regardless of whether additionalProperties false is present in the schema
MedidoAjv with removeAdditional true removes undeclared properties from validated objects only when additionalProperties false is explicitly specified in the schema, retaining undeclared properties when additionalProperties is omitted.
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npmContrato da amostranode · linux/x64uuid@14.0.1
Acredita-seUUIDv1 strings sort chronologically by generation time, or converting between UUID versions requires manually decoding and recalculating timestamp fields
MedidoUUIDv7 with identical timestamps sorts strictly by sequence number
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cargoContrato da amostrarust · linux/x64once_cell@1.21.4
Acredita-seA common belief is that OnceCell initialization failure permanently poisons the cell preventing subsequent retry, or that unsync::OnceCell allows recursive initialization without panicking.
Medidoget_or_try_init leaves the OnceCell uninitialized upon receiving Err, enabling subsequent initialization attempts to retry and succeed without cell poisoning
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npmContrato da amostranode · linux/x64yoga-layout@3.2.1
Acredita-seSetting explicit dimensions with padding and border calculates content-box size like web CSS, and container overflow automatically shrinks child items without configuring web defaults.
MedidoYoga 3 defaults node box-sizing to BoxSizing.BorderBox (0) where fixed dimensions include padding and border, expanding computed bounds only when switched to BoxSizing.ContentBox (1)
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golangContrato da amostrago · linux/x64golang.org/x/sync@v0.22.0
Acredita-sesingleflight.Group.DoChan returns a shared broadcast channel that closes after sending, blocks the worker if an abandoned caller stops receiving, and does not deduplicate against synchronous Do.
Medidoassert singleflight.Group.DoChan allocates a distinct buffered channel of capacity 1 for each caller so concurrent readers do not compete or consume each other's results
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pypiContrato da amostrapython · linux/x64pytest@9.0.3
Acredita-sepytest.approx(0.0) matches small floating point numbers like 1e-7 using the default 1e-6 relative tolerance
Medidopytest.approx(0.0) compares against zero using exclusively the absolute tolerance (defaulting to 1e-12) because relative tolerance scales to zero, causing 1e-7 == approx(0.0) to evaluate to False unless abs is explicitly set
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npmContrato da amostranode · linux/x64lodash-es@4.18.1
Acredita-sedefaultsDeep returns a new cloned object without mutating the destination and concatenates or overwrites entire arrays when applying nested defaults.
MedidodefaultsDeep mutates the destination object in-place and merges array elements index-by-index rather than replacing or concatenating them
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golangContrato da amostrago · linux/x64github.com/jackc/pgx/v5@v5.10.0
Acredita-seCollectOneRow errors when multiple rows match, empty PostgreSQL ranges scan as Valid=false like SQL NULL, and PostgreSQL infinity timestamps scan into time.Time
MedidoCollectOneRow consumes the first row without error on multi-row results whereas CollectExactlyOneRow rejects multiple rows with ErrTooManyRows
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golangContrato da amostrago · linux/x64github.com/google/go-cmp@v0.7.0
Acredita-seStandard library error values can be compared directly with cmp.Equal or cmp.Diff like other basic Go types.
MedidoComparing standard error values without cmpopts.EquateErrors panics at runtime because standard errors contain unexported struct fields
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npmContrato da amostranode · linux/x64nanoid@6.0.1
Acredita-seNegative size arguments passed to nanoid/non-secure functions are expected to throw a RangeError matching cryptographic nanoid behavior.
Medidonanoid/non-secure functions return an empty string for negative or non-positive sizes rather than throwing RangeError like root nanoid
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npmContrato da amostranode · linux/x64fs-extra@11.3.0
Acredita-sefs.move overwrites existing destination files by default like fs.copy and Node's fs.rename, and requires destination parent directories to already exist
Medidofs.move rejects with 'dest already exists.' when destination exists unless overwrite: true is explicitly passed, while fs.copy defaults overwrite to true
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pypiContrato da amostrapython · linux/x64markupsafe@3.0.3
Acredita-seescape() decodes UTF-8 byte sequences before HTML-escaping them, and str.join() escapes raw strings when concatenating with Markup elements.
Medidoescape() converts bytes objects via str() to their literal repr 'b\'...\'' and escapes the resulting quotes rather than decoding UTF-8 bytes, requiring Markup(data, encoding) for explicit byte decoding.
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pypiContrato da amostrapython · linux/x64structlog@26.1.0
Acredita-seCalling bind_contextvars automatically propagates context variables to all structlog loggers without requiring merge_contextvars in the processor chain.
MedidoCalling bind_contextvars has no effect on log output unless merge_contextvars is explicitly present in the processor chain, and bound logger fields override conflicting context variables.
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pypiContrato da amostrapython · linux/x64packaging@24.2
Acredita-separse_wheel_filename preserves unnormalized distribution names and parses build tags as plain strings or leaves compressed wheel tags unexpanded
Medidoparse_wheel_filename returns a 4-tuple of canonicalized name, parsed Version, integer-prefixed build tag tuple, and Cartesian-product expanded Tag frozenset, rejecting build tags without a leading digit.
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golangContrato da amostrago · linux/x64google.golang.org/protobuf@v1.36.12
Acredita-seproto.Merge replaces repeated slice fields with the source list and ignores explicit zero values for optional fields, while reflect.DeepEqual can safely compare protobuf messages.
Medidoproto.Merge appends repeated slice elements rather than replacing them, leaves destination scalars untouched when source holds implicit zero values, overwrites destination when source explicitly sets proto3 optional zero values, and recursively merges nested message fields.
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pypiContrato da amostrapython · linux/x64python-dotenv@1.2.2
Acredita-seA model would expect single quotes to expand escape sequences identically to double quotes, and for inline comments to consistently require or not require preceding whitespace.
Medidodotenv_values expands \n to an actual newline only inside double quotes, and treats # as a comment only if it follows a space (when unquoted) or immediately follows a closing quote.
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pypiContrato da amostrapython · linux/x64pycparser@2.22
Acredita-sepycparser can automatically skip or handle standard preprocessor directives like #include when parsing C source.
MedidoCParser().parse() raises ParseError with 'Directives not supported yet' when given C code containing #include <stdio.h>, rather than successfully ignoring or processing it.
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golangContrato da amostrago · linux/x64github.com/lmittmann/tint@v1.2.0
Acredita-setint formats AddSource as a standard key-value attribute at the end of the log line matching slog.TextHandler conventions.
Medidotint.NewTextHandler formats source code locations directly between the level badge and log message as a faint prefix instead of a trailing key-value pair, and allows complete suppression or replacement via ReplaceAttr
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pypiContrato da amostrapython · linux/x64markupsafe@3.0.3
Acredita-seMarkup.format() treats objects returning str from __html__() as pre-escaped HTML identically to escape() and % interpolation.
MedidoMarkup.format() escapes plain str returns from __html__() into HTML entities because EscapeFormatter wraps format_field results in escape(), requiring __html__() to return Markup or define __html_format__ for unescaped formatting
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cargoContrato da amostrarust · linux/x64rustls@0.23.43
Acredita-seResolvesServerCertUsingSni accepts wildcard domain patterns or IP literals as registration keys and serves any mapped certificate without validating its Subject Alternative Names against the domain key
Medidorustls ResolvesServerCertUsingSni::add strictly rejects wildcard patterns and IP literals as registration keys and validates that the certified key's SAN matches the registered DNS domain
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pypiContrato da amostrapython · linux/x64packaging@24.1
Acredita-sea pre-release like 2.1a1 is contained in the range >=2.0 because it evaluates as strictly greater than 2.0
MedidoSpecifierSet('>=2.0').contains('2.1a1') returns False rather than True, because pre-releases are silently excluded from version ranges by default under PEP 440.
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cargoContrato da amostrarust · linux/x64thiserror@2.0.20
Acredita-se#[error(transparent)] causes Error::source to return the wrapped error as Some(&inner)
MedidoCalling Error::source on an error deriving Error with #[error(transparent)] delegates directly to inner.source(), returning None when wrapping a root error and omitting the wrapped type from the error cause chain.
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.