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Update compatibility.md (#566)

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Update `__len` metamethod (pending the code change that implements this)
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Arseny Kapoulkine 2022-06-30 17:07:56 -07:00 • committed by GitHub
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@ -54,7 +54,7 @@ Sandboxing challenges are [covered in the dedicated section](sandbox).
| goto statement | ❌ | this complicates the compiler, makes control flow unstructured and doesn't address a significant need | | goto statement | ❌ | this complicates the compiler, makes control flow unstructured and doesn't address a significant need |
| finalizers for tables | ❌ | no `__gc` support due to sandboxing and performance/complexity | | finalizers for tables | ❌ | no `__gc` support due to sandboxing and performance/complexity |
| no more fenv for threads or functions | 😞 | we love this, but it breaks compatibility | | no more fenv for threads or functions | 😞 | we love this, but it breaks compatibility |
| tables honor the `__len` metamethod | 🤷‍♀️ | performance implications, no strong use cases | tables honor the `__len` metamethod | ✔️ | |
| hex and `\z` escapes in strings | ✔️ | | | hex and `\z` escapes in strings | ✔️ | |
| support for hexadecimal floats | 🤷‍♀️ | no strong use cases | | support for hexadecimal floats | 🤷‍♀️ | no strong use cases |
| order metamethods work for different types | ❌ | no strong use cases and more complicated semantics, compatibility and performance implications | | order metamethods work for different types | ❌ | no strong use cases and more complicated semantics, compatibility and performance implications |