This is fundamentally different from Web streams' pipeThrough(), which starts actively pumping data from the source to the transform as soon as you set up the pipe. Pull semantics mean you control when processing happens, and stopping iteration stops processing.
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事实上，在一些代孕纠纷中，代孕母亲与委托父母之间的关系并非始终稳定。邹露璐提到，部分情况下，代孕母亲可能因情感因素或经济纠纷拒绝让出孩子抚养权，或以身份关系为筹码主张费用。一旦进入诉讼程序，法院往往不会认可所谓“代孕协议”的效力，而是依据分娩事实确认母子关系。
Nature, Published online: 25 February 2026; doi:10.1038/s41586-026-10150-1