Number tag does not work and causes ui to break

[alexwaweru]

The Number tag seems to be broken and causes issues even when rendering a self hosted lb.

Tried it on the playground and here is the console error:

Uncaught Error: No model registered for tag: number
Available models:
	audio
	audioplus
	hypertext
	polygonregion
	brushregion
	keypointregion
	rectangleregion
	ellipseregion
	image
	text
	channel
	timeseries
	label
	labels
	paragraphlabels
	textarearegion
	textarea
	choice
	choices
	rating
	paragraphs
	video
	brush
	brushlabels
	hypertextlabels
	keypoint
	keypointlabels
	list
	pairwise
	polygon
	polygonlabels
	ranker
	rectangle
	rectanglelabels
	shortcut
	taxonomy
	timeserieslabels
	ellipse
	ellipselabels
	relations
	relation
	dialog
	header
	table
	view
	style
	filter
	panel
	collapse
	timeseriesregion
    at e.value (Registry.js:99:13)
    at e.value (ConfigValidator.js:234:30)
    at e.value (index.js:67:27)
    at Object.validate (CompletionStore.js:947:23)
    at be (mobx.module.js:928:19)
    at r (mobx.module.js:915:16)
    at mobx-state-tree.module.js:2593:35
    at ke (mobx-state-tree.module.js:2456:16)
    at Object.r (mobx-state-tree.module.js:2483:16)
    at Object.o (CompletionStore.js:791:12)