This was originally implemented under #13936 last time I raised it (#8097), but looks like it's back again in later API versions.
Added to 2020-10-01:
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"zoneMappings": { |
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"type": "array", |
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"items": { |
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"$ref": "#/definitions/ZoneMapping" |
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} |
Removed in 2021-04-01:
https://github.com/Azure/azure-rest-api-specs/blob/main/specification/resources/resource-manager/Microsoft.Resources/stable/2021-04-01/resources.json