Why is that when in a signal store (in a service), when I do

Service

  protected static readonly removedAllowances: WritableSignal<(ContractAllowanceDTO)[]> = signal<(ContractAllowanceDTO})[]>([]);

  /* getters */
  public getRemovedllowances() {
    return computed(() => ContractService.removedAllowances())
  }

Component

In the component class

  protected readonly removedAllowances = this.contractService.getRemovedAllowances();

  let removedAllowances: any[];
  removedAllowances = this.removedAllowances();

  removedAllowances.pop();
  console.log('allowance', this.contractService.getRemovedAllowances()())

It’s console logging the result as if the variable in the service, ContractService.removedAllowances(), has also been popped. I thought signals were read only? Why should removedAllowances.pop() at all affect ContractService.removedAllowances()?