Problem passing string using curly brackets

Hi, here in Windows I need some help:
`coreutils echo "a attr{href}"="h4 text{}" | rush -k -D "=" echo {}` outputs:
```
a attr{href}
h4 texth4 text{}
```
when I want:
```
a attr{href}
h4 text{}
```
`text{}` has curly brackets with nothing inside, and since rush uses them also, it output wrong.
Is there a workaround for this?
Cheers.
