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 76–100 件目(全 568 件)。
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gemサンプル契約ruby · linux/x64activesupport@8.1.3.1
信じられていることActiveSupport::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.
測定結果ActiveSupport::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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pypiサンプル契約python · linux/x64greenlet@3.5.4
信じられていることA 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.
測定結果A 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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golangサンプル契約go · linux/x64gopkg.in/yaml.v3@v3.0.1
信じられていることUnmarshaling a YAML mapping directly into *yaml.Node produces a MappingNode whose Content slice holds child values.
測定結果yaml.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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npmサンプル契約node · linux/x64ajv@8.20.0
信じられていることSetting removeAdditional true in Ajv options strips all undeclared properties from validated objects regardless of whether additionalProperties false is present in the schema
測定結果Ajv 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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npmサンプル契約node · linux/x64uuid@14.0.1
信じられていることUUIDv1 strings sort chronologically by generation time, or converting between UUID versions requires manually decoding and recalculating timestamp fields
測定結果UUIDv7 with identical timestamps sorts strictly by sequence number
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cargoサンプル契約rust · linux/x64once_cell@1.21.4
信じられていることA common belief is that OnceCell initialization failure permanently poisons the cell preventing subsequent retry, or that unsync::OnceCell allows recursive initialization without panicking.
測定結果get_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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npmサンプル契約node · linux/x64yoga-layout@3.2.1
信じられていることSetting explicit dimensions with padding and border calculates content-box size like web CSS, and container overflow automatically shrinks child items without configuring web defaults.
測定結果Yoga 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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golangサンプル契約go · linux/x64golang.org/x/sync@v0.22.0
信じられていることsingleflight.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.
測定結果assert 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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pypiサンプル契約python · linux/x64pytest@9.0.3
信じられていることpytest.approx(0.0) matches small floating point numbers like 1e-7 using the default 1e-6 relative tolerance
測定結果pytest.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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npmサンプル契約node · linux/x64lodash-es@4.18.1
信じられていることdefaultsDeep returns a new cloned object without mutating the destination and concatenates or overwrites entire arrays when applying nested defaults.
測定結果defaultsDeep mutates the destination object in-place and merges array elements index-by-index rather than replacing or concatenating them
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golangサンプル契約go · linux/x64github.com/jackc/pgx/v5@v5.10.0
信じられていることCollectOneRow errors when multiple rows match, empty PostgreSQL ranges scan as Valid=false like SQL NULL, and PostgreSQL infinity timestamps scan into time.Time
測定結果CollectOneRow consumes the first row without error on multi-row results whereas CollectExactlyOneRow rejects multiple rows with ErrTooManyRows
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golangサンプル契約go · linux/x64github.com/google/go-cmp@v0.7.0
信じられていることStandard library error values can be compared directly with cmp.Equal or cmp.Diff like other basic Go types.
測定結果Comparing standard error values without cmpopts.EquateErrors panics at runtime because standard errors contain unexported struct fields
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npmサンプル契約node · linux/x64nanoid@6.0.1
信じられていることNegative size arguments passed to nanoid/non-secure functions are expected to throw a RangeError matching cryptographic nanoid behavior.
測定結果nanoid/non-secure functions return an empty string for negative or non-positive sizes rather than throwing RangeError like root nanoid
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npmサンプル契約node · linux/x64fs-extra@11.3.0
信じられていることfs.move overwrites existing destination files by default like fs.copy and Node's fs.rename, and requires destination parent directories to already exist
測定結果fs.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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pypiサンプル契約python · linux/x64markupsafe@3.0.3
信じられていることescape() decodes UTF-8 byte sequences before HTML-escaping them, and str.join() escapes raw strings when concatenating with Markup elements.
測定結果escape() 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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pypiサンプル契約python · linux/x64structlog@26.1.0
信じられていることCalling bind_contextvars automatically propagates context variables to all structlog loggers without requiring merge_contextvars in the processor chain.
測定結果Calling 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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pypiサンプル契約python · linux/x64packaging@24.2
信じられていることparse_wheel_filename preserves unnormalized distribution names and parses build tags as plain strings or leaves compressed wheel tags unexpanded
測定結果parse_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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golangサンプル契約go · linux/x64google.golang.org/protobuf@v1.36.12
信じられていることproto.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.
測定結果proto.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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pypiサンプル契約python · linux/x64python-dotenv@1.2.2
信じられていることA 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.
測定結果dotenv_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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pypiサンプル契約python · linux/x64pycparser@2.22
信じられていることpycparser can automatically skip or handle standard preprocessor directives like #include when parsing C source.
測定結果CParser().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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golangサンプル契約go · linux/x64github.com/lmittmann/tint@v1.2.0
信じられていることtint formats AddSource as a standard key-value attribute at the end of the log line matching slog.TextHandler conventions.
測定結果tint.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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pypiサンプル契約python · linux/x64markupsafe@3.0.3
信じられていることMarkup.format() treats objects returning str from __html__() as pre-escaped HTML identically to escape() and % interpolation.
測定結果Markup.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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cargoサンプル契約rust · linux/x64rustls@0.23.43
信じられていることResolvesServerCertUsingSni 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
測定結果rustls 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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pypiサンプル契約python · linux/x64packaging@24.1
信じられていることa pre-release like 2.1a1 is contained in the range >=2.0 because it evaluates as strictly greater than 2.0
測定結果SpecifierSet('>=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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cargoサンプル契約rust · linux/x64thiserror@2.0.20
信じられていること#[error(transparent)] causes Error::source to return the wrapped error as Some(&inner)
測定結果Calling 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.
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。