realm-cli push has issues with UTF-8 characters

[jonshipman]

• pulled application with a function that has utf characters
• pushed function to another application
• push fails

push failed: Error in functions:
- latlong: unknown: Unexpected character '�'. (642:69)

Push appears to only fail when attempting to upload a custom_resolver/*.json file whose resolver function calls the offending function.

[jonshipman]

Checking the function shows that the character at 642:69 is Δ
Of note, this character appears several times in the function and ream-cli push only complains about this line.

const Δλ = λ2 - λ1;

const x = Math.sin(φ1) * Math.cos(φ2) * Math.cos(φ) * Math.sin(Δλ);
const y =
  Math.sin(φ1) * Math.cos(φ2) * Math.cos(φ) * Math.cos(Δλ) -
  Math.cos(φ1) * Math.sin(φ2) * Math.cos(φ);
const z = Math.cos(φ1) * Math.cos(φ2) * Math.sin(φ) * Math.sin(Δλ);

Line 642 would be the last line in the block above.