anyone knows why an interval will make the lines broken with gap? ```js Plot.lineY(aaplMissing, {x: "date", y: "close", stroke: "steelblue", interval: d3.utcMonth, }), ```

it's not resolved; when an interval option is given, it will be broken line with gaps: ```js Plot.lineY(aaplMissing, {x: "date", y: "close", stroke: "steelblue", interval: d3.utcMonth, }), ```

Yes, that is what this notebook is about: broken lines for data with gaps (for this reason, the dataset here is called aapl*Missing*). Please see other line chart notebooks for datasets with no gaps, or open a discussion giving more details about what you are trying to achieve and what is not working as expected: https://github.com/observablehq/plot/discussions