Hellow

https://github.com/NativeScript/NativeScript/blob/master/tns-core-modules/ui/text-base/text-base.android.ts#L327

if you have object like

[{ id: 1 }, { id: 2 }]

and code in repeater

<Label class="label" text="{{ id }}"/>

and style

label { text-tranform: uppercase; }

so error occurs

TypeError: text.toUpperCase is not a function

for me fails only Android 7. iOS - ok

Solution: In future release add String(text).toUpperCase or check if input value numeric do nothing