Support fractional minzoom values

[vicapow]

minzoom and maxzoom on layers don't seem to respect floating point values and instead round up.

Here's a quick demo: https://jsfiddle.net/oopkjeak/16/

If this is expected, maybe the docs should mention this and style validators should check for integers?

Otherwise, it would be awesome to support floating point values!

[shortsleeves]

FWIW - The style spec seems to indicate floats should be valid: #layer-minzoom

[lucaswoj]

This is not but could be supported 😄

[lucaswoj]

Let me know if there is anything I can to do help you put together a PR @vicapow. 🙇

[mollymerp]

fwiw maxzoom seems to respect float values https://jsfiddle.net/cmozpyyk/

[vicapow]

@lucaswoj I spent some time digging but wasn't able to find where this is happening. Any pointers on where to look? really odd that this happens for min but not max.

[lucaswoj]

My theory is that the library that creates vector tiles, geojson-vt, is generating tiles from floor(minzoom) to floor(maxzoom). We can overzoom to render tiles > maxzoom but we cannot "underzoom" to render tiles < minzoom. The fix may be to explicitly ceil(minzoom) before passing it to geojson-vt

[asheemmamoowala]

Close in #5039