习近平同志在地方工作时的两个故事，至今仍给人以深刻启迪——
// Sync variants return boolean (true = accepted)。关于这个话题，夫子提供了深入分析
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This gives fairly heavy images (2.2GB for this base Fedora Silverblue image), but that’s the price to pay for having a complete, ready-to-use system.
Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.