Version
1.7.7
Environment
Vue 2.6 IE 11 Windows10
Reproduction link

Steps to reproduce
Join the ALLOW-CLEAR attribute in the input Form form, then enter the value click to clear the icon, it will report an error: "Error IN V-ON Handler:" TypeError: Strict Strict Strict mode does not allow allocation to read-only properties "" Make sure to be in the IE11 version
What is expected?
Clear content in Input
What is actually happening?
I feel that everything is normal, I don't know what happened.