fix incorrect regular expressions for uint base types (#605)

Closes #556

Note the slot parameter of eth_getStorageAt had to be relaxed to bytesMax32, since the
new uint256 pattern disallows leading zero, but usage of leading zero is commonplace
for storage slots.

---------

Co-authored-by: Felix Lange <[email protected]>

Author: PelleKrab

src/eth/state.yaml

@@ -33,7 +33,9 @@
     - name: Storage slot
       required: true
       schema:
-        $ref: '#/components/schemas/uint256'
+        # this used to require strict uint256, but usage of leading zero is commonplace,
+        # so we can't disallow it.
+        $ref: '#/components/schemas/bytesMax32'
     - name: Block
       required: true
       schema:

src/schemas/base-types.yaml

@@ -51,15 +51,15 @@ ratio:
 uint:
   title: hex encoded unsigned integer
   type: string
-  pattern: ^0x([1-9a-f]+[0-9a-f]*|0)$
+  pattern: ^0x(0|[1-9a-f][0-9a-f]*)$
 uint64:
   title: hex encoded 64 bit unsigned integer
   type: string
-  pattern: ^0x([1-9a-f]+[0-9a-f]{0,15})|0$
+  pattern: ^0x(0|[1-9a-f][0-9a-f]{0,15})$
 uint256:
   title: hex encoded 256 bit unsigned integer
   type: string
-  pattern: ^0x([1-9a-f]+[0-9a-f]{0,31})|0$
+  pattern: ^0x(0|[1-9a-f][0-9a-f]{0,63})$
 hash32:
   title: 32 byte hex value
   type: string