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# Gc
---
Hold multiple references to the same object
```text
Gc[Type; GC_FLAGS]
```
# Alias
```text
Shared[Generic.T] `alias Gc[Generic.T; GC_FLAGS]
```
## `GC_FLAGS`
### Lock Mutex
The shared type has been detected across asynchronous tasks and needs to lock the mutex on mutation
# Garbage Collection
A tracing mark and sweep garbage collector is used
# Mutating
```text
x : Shared[Array] $ (1; 2; 3)
^ x {[y]
y `push 4
}
`log x // Shared[Array[I64]] $ (1; 2; 3; 4)
```
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