timestamp is always iso instant form

timestamp = 2026-05-12T15:59:50.582927163, RequestBoundApiResultFactoryPropertyTest:timestamp is always iso instant form = 
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tries = 1000                  | # of calls to property
checks = 1000                 | # of not rejected calls
generation = RANDOMIZED       | parameters are randomly generated
after-failure = SAMPLE_FIRST  | try previously failed sample, then previous seed
when-fixed-seed = ALLOW       | fixing the random seed is allowed
edge-cases#mode = MIXIN       | edge cases are mixed in
edge-cases#total = 4          | # of all combined edge cases
edge-cases#tried = 4          | # of edge cases tried in current run
seed = 2228257119070284704    | random seed to reproduce generated values