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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Feature: allow typed arrays to be used for the data.transforms.groups value","articleBody":"I have a very high cardinality data set that I am trying to store only in typed arrays. Plotly already accepts typed arrays for the `data.x` and `data.y` values, which is great. However, I want to color the points based on the groups they belong to, and I would like to store those groups in a typed array as well. So instead of:\r\n```\r\n{\r\n      type: 'scattergl',\r\n      mode: 'markers',\r\n      transforms: [{\r\n        type: 'groupby',\r\n        groups: [1, 2, 3]\r\n      }]\r\n}\r\n```\r\nit would be \r\n```\r\n{\r\n      type: 'scattergl',\r\n      mode: 'markers',\r\n      transforms: [{\r\n        type: 'groupby',\r\n        groups: new Uint8Array([1, 2, 3])\r\n      }]\r\n}\r\n```\r\nI looked at the code, and it seems to be as easy as changing the line 175 in [groupby.js](https://github.com/plotly/plotly.js/blob/master/src/transforms/groupby.js) from:\r\n`if(!(Array.isArray(groups)) || groups.length === 0) {`\r\nto something like:\r\n`if(!(Array.isArray(groups) || groups.constructor === Uint8Array) || groups.length === 0) {`\r\n\r\nwould this be doable? Thanks!\r\n","author":{"url":"https://github.com/danieljblinick","@type":"Person","name":"danieljblinick"},"datePublished":"2019-12-02T12:20:01.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/4397/plotly.js/issues/4397"}