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* test: add openapi.IsNamespaceScoped benchmark Add a benchmark test for IsNamespaceScoped performance when the default schema is in use. * perf: limit initSchema calls from openapi.IsNamespaceScoped Avoid calling initSchema from openapi.IsNamespaceScoped when possible. Work done in #4152 introduced a precomputed namespace scope map based on the default built-in schema. This commit extends that work by avoiding calls to initSchema when a resource is not found in the precomputed map and the default built-in schema is in use. In those cases, there is no benefit to calling initSchema since the precomputed map is exactly what will be calculated by parsing the default built-in schema. * fix: delay parsing of default built-in schema When namespace scope can be determined by the precomputed map but the type is not present in the precomputed map, delay the parsing of the default built-in schema. If the schema to be initialized is the default built-in schema and the type is not in the precomputed map, then the type will not be found in the default built-in schema. There is no need to parse the default built-in schema for that answer; its parsing may be delayed until it is needed for some other purpose. In cases where the schema is used solely for namespace scope checks, the schema might not ever be parsed. Skipping the parsing reduces both execution time and memory use. * fix: correct openapi.go's schemaNotParsed value openapiData initializes with defaultBuiltInSchemaParseStatus set to 0, so schemaNotParsed should have 0 as its value.