サンプル

json 2.9.1: Manage IO stream lifecycles, EOF positions, and monolithic buffer allocations in JSON.dump and JSON.load

検証済みサンプル — gem json 2.9.1: Manage IO stream lifecycles, EOF positions, and monolithic buffer allocations in JSON.dump and JSON.load. ruby 3 · linux…

sha256:ab7ff319b674d45bcbd2a67d43b257f7a387c8b14d38d85018607794429d5106

MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

宣言された環境 ruby linux x64 ruby ruby rubygems

環境	コントラクト	ステージ	実行日
ruby 3 · linux debian/x64 · docker ed25519:d91480838ac982c9	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1	2026-08-17
ruby 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1	2026-08-18

HOW

ゴール: Manage IO stream lifecycles, EOF positions, and monolithic buffer allocations in JSON.dump and JSON.load
パッケージ: json 2.9.1
シンボル: JSON.dump
JSON.load
JSON.parse
JSON::Parser
JSON::State
環境: ruby
作成日: 2026-08-17T02:43:58Z

assert JSON.dump and JSON.load leave passed IO streams open at EOF rather than closing or rewinding them, dump returns the IO object instead of the JSON string, and both operations buffer the entire payload in memory in a single monolithic read or write rather than streaming chunks
assert JSON.dump and JSON.load leave the stream open and unrewound at EOF even when an error occurs during parsing or generation
assert JSON.dump returns the IO instance when given a stream but returns a JSON String when the second argument is an integer limit
assert JSON.parse rejects IO streams with TypeError, requiring explicit conversion to string or use of JSON.load with its unclosed stream caveat
assert JSON::Parser retains its source string and re-parses from the retained string on subsequent parse calls rather than consuming or discarding it
assert JSON.dump buffers the complete document before calling IO#write once, so a slow or aborted dump writes zero bytes rather than partial fragments