Validating strings with StringLenBetween incorrectly fails for UTF-8 encoded values

[goodtune]

SDK version

HEAD

Relevant provider source code

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Terraform Configuration Files

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Debug Output

n/a

Expected Behavior

With a provider that wants to validate a String with StringLenBetween(1, 5) and a value of "你好世界" is provided, the validation should be successful.

Actual Behavior

Fails with expected length of test_property to be in the range (1 - 5), got 你好世界.

Steps to Reproduce

Unit test in 2f48bd8

References

n/a