A string that specifies how the inputs should be compared.

While the API accepts both versions for "less/greater than or equal to" and "not equal", it'll always return "≥", "≤" or "≠" respectively when reading them back.

Union members

`"="`	"equal to"
`">"`	"greater than"
`"<"`	"lesser than"
`"≥"`	"greater than or equal to"
`">="`	"greater than or equal to"
`"≤"`	"lesser than or equal to"
`"<="`	"lesser than or equal to"
`"≠"`	"not equal to"
`"!="`	"not equal to"