Document new implementation-defined limits in MVP.md

Based on discussion in #335 and subgroup meetings.
WebAssembly · Mar 23, 2023 · 8fba1df · 8fba1df
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diff --git a/proposals/gc/MVP.md b/proposals/gc/MVP.md
@@ -779,6 +779,14 @@ The opcode for heap types is encoded as an `s33`.
 | 0xfb70 | `extern.internalize` | |
 | 0xfb71 | `extern.externalize` | |
 
+## Implementation-defined Limits
+
+The following limits will be added to the Implementation-defined Limits [section](https://webassembly.github.io/spec/js-api/index.html#limits) of the JS API.
+
+ - The maximum number of recursion groups is 1000000. (The maximum number of individual types remains unchanged and is also 1000000.)
+ - The maximum number of struct fields is 10000.
+ - The maximum number of operands to `array.new_fixed` is 10000.
+ - The maximum length of a supertype chain is 63. (A type declared with no supertypes has a supertype chain of length 0)
 
 ## JS API