panic since v1.9.0 with nil string pointer

[jerome-laforge]

with this code:

func TestNilStringPointer(t *testing.T) {
	var s *string
	t.Log(cast.ToStringE(s))
}

got a recursive deadlock:

runtime: goroutine stack exceeds 1000000000-byte limit
runtime: sp=0xc020602398 stack=[0xc020602000, 0xc040602000]
fatal error: stack overflow

goroutine 20 gp=0xc0005828c0 m=0 mp=0x122e5e0 [running]:
reflect.valueInterface({0xa84060?, 0x0?, 0x16?}, 0x1?)
	go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.3.linux-amd64/src/reflect/value.go:1487 +0x115 fp=0xc0206023a8 sp=0xc0206023a0 pc=0x4f0a15
reflect.Value.Interface(...)
	go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.3.linux-amd64/src/reflect/value.go:1484
github.com/spf13/cast.indirect({0xa84060, 0x0})
	go/pkg/mod/github.com/spf13/cast@v1.9.0/indirect.go:31 +0x11a fp=0xc0206023f8 sp=0xc0206023a8 pc=0x78887a
github.com/spf13/cast.ToStringE({0xa84060, 0x0})
	go/pkg/mod/github.com/spf13/cast@v1.9.0/basic.go:121 +0x49f fp=0xc020602480 sp=0xc0206023f8 pc=0x78865f
github.com/spf13/cast.ToStringE({0xa84060, 0x0})
	go/pkg/mod/github.com/spf13/cast@v1.9.0/basic.go:122 +0x53e fp=0xc020602508 sp=0xc020602480 pc=0x7886fe
github.com/spf13/cast.ToStringE({0xa84060, 0x0})
	go/pkg/mod/github.com/spf13/cast@v1.9.0/basic.go:122 +0x53e fp=0xc020602590 sp=0xc020602508 pc=0x7886fe

want empty string

[sagikazarmark]

Should be fixed in 1.9.1