feat(FXC-4519): Added check to warn of duplicated voltage values

[marc-flex]

Greptile Summary

Added validation to DCVoltageSource that warns users when duplicate voltage values are detected in the voltage array. The implementation treats 0 and -0 as the same value by normalizing zeros before checking for duplicates.

• Implemented check_repeated_voltage validator that normalizes zero values and uses np.unique() to detect duplicates
• Added comprehensive test coverage including edge cases for zero normalization and multiple duplicates
• Updated CHANGELOG.md with clear user-facing description of the new feature

Note: Previous thread comments identified a floating-point precision issue - the current implementation only normalizes zeros but uses direct equality for non-zero values via np.unique(), which may miss near-duplicate floating-point values like 1.0 and 1.0000000001.

Confidence Score: 4/5

• This PR is safe to merge with minor style improvements recommended
• The implementation is functionally correct for the intended use case of detecting exact duplicates and normalizing zeros. Previous thread already identified the floating-point precision consideration for non-zero values. Test coverage is comprehensive. Only minor style improvement suggested for message formatting.
• Pay attention to tidy3d/components/spice/sources/dc.py regarding the floating-point comparison approach discussed in previous comments

Important Files Changed

Filename	Overview
tidy3d/components/spice/sources/dc.py	Added duplicate voltage validation with zero normalization. Previous thread identified floating-point precision issue that needs addressing.
tests/test_components/test_heat_charge.py	Comprehensive test coverage for duplicate voltage warning, including edge cases like 0/-0 and multiple duplicates.
CHANGELOG.md	Clear changelog entry in Added section describing the new validation feature.

Sequence Diagram

sequenceDiagram
    participant User
    participant DCVoltageSource
    participant Validator
    participant numpy as NumPy
    participant Logger

    User->>DCVoltageSource: Create with voltage array
    DCVoltageSource->>Validator: @validator("voltage") check_voltage
    Validator->>Validator: Check for infinite values
    Validator-->>DCVoltageSource: Return validated values
    
    DCVoltageSource->>Validator: @validator("voltage") check_repeated_voltage
    Validator->>numpy: np.isclose(val, 0, atol=1e-10)
    numpy-->>Validator: Boolean mask for zeros
    Validator->>numpy: np.where(mask, 0.0, val)
    numpy-->>Validator: Normalized array (zeros unified)
    Validator->>numpy: np.unique(normalized)
    numpy-->>Validator: Unique values array
    Validator->>Validator: Compare len(unique_values) < len(val)
    alt Duplicates found
        Validator->>Logger: log.warning(duplicate message)
        Logger-->>User: Display warning
    end
    Validator-->>DCVoltageSource: Return original values
    DCVoltageSource-->>User: Instance created

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Note

Introduces a tolerance-based warning for duplicate entries in DCVoltageSource.voltage, normalizing 0/-0 and logging a warning when repeats are detected.

• Adds _count_unique_with_tolerance and a @validator (check_repeated_voltage) in dc.py to detect near-duplicates via np.isclose, treating 0 and -0 as the same
• Extends tests with test_repeated_voltage_warning to assert warning behavior for unique values, exact duplicates, 0 vs -0, and multiple repeats
• Updates CHANGELOG.md to document the new validation

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[Copilot]

Pull request overview

This PR adds validation to the DCVoltageSource class to warn users when duplicate voltage values are present in the voltage array. The implementation correctly handles the special case where 0.0 and -0.0 are treated as the same value.

• Added a new validator check_repeated_voltage that warns when duplicate voltage values are detected
• Implemented special handling to normalize 0.0 and -0.0 as the same value before checking for duplicates
• Added comprehensive test coverage for various duplicate scenarios

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
tidy3d/components/spice/sources/dc.py	Added new validator method check_repeated_voltage with logic to detect and warn about duplicate voltage values, including special handling for zero values
tests/test_components/test_heat_charge.py	Added test function test_repeated_voltage_warning with multiple test cases covering unique values, repeated values, 0/-0 duplicates, and multiple repeated values

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[marc-flex]

@greptile update summary

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Diff Coverage

Diff: origin/develop...HEAD, staged and unstaged changes

• tidy3d/components/spice/sources/dc.py (94.7%): Missing lines 86

Summary

• Total: 19 lines
• Missing: 1 line
• Coverage: 94%

tidy3d/components/spice/sources/dc.py

Lines 82-90

  82         Uses sorted comparison to group values that are practically equal
  83         due to floating-point representation differences (e.g., single vs double precision).
  84         """
  85         if len(arr) == 0:
! 86             return 0
  87         sorted_arr = np.sort(arr)
  88         # Count values that are "different enough" from their predecessor
  89         unique_count = 1
  90         for i in range(1, len(sorted_arr)):

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