Support "pending" parameter for Web3 getTransactionCount #696
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Description
The ethereum Web3 allows most functions that take a block number as parameter to also take the special keywords "pending", "latest", or "earliest". The current Web3 implementation of getTransactionCount errors out if it is called with "pending".
Note: It might be important to go through the other Web3 functions that take a block number as a parameter and make sure we support these 3 special parameters.
Fixes Issue #695.
Type of change
Insert x into the following checkboxes to confirm (eg. [x]):
Testing
Manually tested that the Web3 API now correctly responds to requests such as
eth.getTransactionCount("address", "pending").then(console.log)
Verification
Insert x into the following checkboxes to confirm (eg. [x]):