"typed_config": {
           "@type": "type.googleapis.com/envoy.extensions.filters.network.tcp_proxy.v3.TcpProxy",
           "stat_prefix": "outbound|15008||httpbin-istio-waypoint.ambient.svc.cluster.local",
           "cluster": "outbound|15008||httpbin-istio-waypoint.ambient.svc.cluster.local"
          }
         }
        ]
       },
       "bind_to_port": false
      },

hex_exponent      = ( "p" | "P" ) [ "+" | "-" ] decimal_digits .
</pre>

<pre>
0.
72.40
072.40       // == 72.40
2.71828
1.e+0
6.67428e-11
1E6
.25
.12345E+5
1_5.         // == 15.0
0.15e+0_2    // == 15.0

0x1p-2       // == 0.25
0x2.p10      // == 2048.0
0x1.Fp+0     // == 1.9375
0X.8p-0      // == 0.5
0X_1FFFP-16  // == 0.1249847412109375